1 syllable:
ass, bass, basse, blass, brass, brasse, cas, cass, casse, chass, chasse, class, classe, crass, crasse, das, dass, dcass, dclass, ddass, drass, fahs, fass, fasse, frass, gas, gass, gasse, glas, glass, glasse, grass, grasse, hass, jass, kass, kasse, klas, klass, klasse, kras, krass, kvass, lass, lasse, mass, mass., masse, nass, nasse, pass, plas, plass, plasse, prass, ras, rasse, sas, sass, sasse, shass, strass, strasse, tass, tasse, trass, trasse, vass, wrass, wrasse, yass, yeahs, aaass, aase, blas, bloss, boiss, bos, boss, boss', bosse, bross, cauce, clauss, clos, closs, cos, coss, cosse, cros, cross, cross-, crosse, daas, dazs, dos, doss, dross, fause, fauss, fausse, floss, flosse, foss, fosse, fross, glauce, gloss, gloss-, glosse, goss, gosse, grosse, haas, haase, haass, hahs, hasse, hnoss, hoss, jboss, joss, josse, kaas, kjos, klaas, klos, kloss, knauss, knous, kos, koss, kosse, krause, krausse, kross, las, loss, maass, mauss, mohs, mos, moss, mosse, motss, nauss, noss, os, oss, pdd nos, phos-, ploss, pos, poss, pross, quass, rnaase, ros, ross, ross', rosse, sauce, schloss, sloss, soss, spross, stauss, stoss, swass, toss, tosse, tross, vause, vohs, vos, voss, vyas, wasce, wass, yoss, zoss

2 syllables:
a-class, aairpass, admass, age class, airgas, airmass, air gas, air mass, alas, alass, alsace, amass, amcas, anlass, art class, audace, bad-ass, badass, band-pass, bandpass, bare-ass, barn grass, bay grass, beargrass, bear grass, beer glass, bell-glass, bell glass, bent-grass, bentgrass, bent grass, besace, big-ass, bindass, black bass, blow gas, bluegrass, bromegrass, broom grass, bumpass, bunchgrass, bunch grass, burgrass, bur grass, by-pass, bypass, camass, cane-grass, chagas, cheatgrass, classpass, cloud grass, coal gas, contrasts, cordgrass, cord grass, couch-grass, couchgrass, couch grass, crabgrass, crab grass, crevasse, crown glass, cut-glass, cut-grass, cutgrass, cut glass, damasse, declass, declasse, deergrass, deer grass, depass, dog grass, donbass, dumb-ass, e-glass, e-zpass, eagrass, ecass, eelgrass, egg-glass, emass, en masse, eyeglass, fat-ass, fatass, fieldglass, field glass, filasse, finglas, first-class, first class, flint glass, flute glass, forecasts, form class, forpass, fourth-class, goat grass, goose-grass, goose grass, groundmass, ground bass, ground glass, hair grass, half-ass, hall pass, hand glass, harass, hard-ass, hardass, hardbass, high-class, high brass, high mass, hoofdklasse, i-pass, ice mass, impasse, ipass, jackass, june grass, keepass, kick-ass, kickass, kiss-ass, knotgrass, kompass, kuzbass, lambastes, landmass, lard-ass, lardass, lastpass, lead glass, life class, lovegrass, love grass, low-class, lowpass, low brass, low mass, lyme grass, make pass, marsh gas, means grass, metglas, miass, midgrass, milk glass, molasse, morass, navras, nerve gas, newgrass, nordpass, nutgrass, nut grass, ofgas, outclass, outlasts, outpass, owlglass, piepgras, pier glass, pin grass, plate-glass, plate glass, plume grass, portass, potass, quackgrass, quack grass, quartz glass, quick grass, recas, red brass, reed grass, repass, rest mass, rhodes grass, ribgrass, ricegrass, rice grass, rock bass, rush-grass, rushgrass, rye-grass, ryegrass, rye grass, sambass, sandglass, sawgrass, screen pass, sea-grass, seabass, seagrass, sea bass, serfass, she-ass, short-grass, shortgrass, shot glass, silkgrass, silk grass, slough grass, smart-ass, smartass, smut grass, snodgrass, soft glass, speargrass, spyglass, stained-glass, stained glass, star grass, stone bass, stormglass, string bass, striped bass, sub-bass, subclass, sunglass, sunpass, surpass, sweet grass, switchgrass, switch grass, sword grass, tall-grass, tallgrass, tape grass, tear gas, third-class, third class, tight-ass, timepass, top-class, town gas, transpass, trespass, tresspass, umass, vanasse, velas, verglas, vorace, watch-glass, watchglass, watch glass, wheat-grass, wheatgrass, wild ass, wineglass, wiregrass, wise-ass, witchgrass, witch grass, wool grass, word class, world-class, worldclass, worldpass, yankass, yardgrass, yard grass, abbas, acoss, across, amboss, ammas, amoss, atroce, back-cross, backcross, beard moss, ben cross, beschloss, beschloss', betoss, bigg boss, black moss, bog moss, bombas, bonasse, bread sauce, brown sauce, bugloss, caguas, cedras, cedras', chandross, chavous, cheese sauce, chiasse, christcross, club-moss, clubmoss, club moss, coloss, colosse, cream sauce, criss-cross, crisscross, culross, cup-moss, danfoss, deboss, demoss, devoss, disoss, ditchmoss, dobcross, duck sauce, ecosse, emboss, endoss, erdgeschoss, feroce, fudge sauce, girlboss, gotaas, greek cross, hamas, hamas', hammas, hammas', hard sauce, hooplas, hot-cross, hot sauce, iapss, imboss, incross, kiryas, koloss, kosmas, kutauss, la-crosse, lacoss, lacross, lacrosse, lafosse, la crosse, lip-gloss, lipgloss, loanloss, long moss, macross, mint sauce, molosse, nahuas, oakmoss, otpotss, outcross, pangloss, pataas, patasse, peach sauce, peat moss, plum sauce, recross, red cross, retoss, rick ross, ringtoss, rose moss, rubasse, scale moss, sea moss, shallcross, shavous, shawcross, shrimp sauce, sinterklaas, soysauce, soy sauce, spectros, spikemoss, spike moss, starcross, steak sauce, stop-loss, straw boss, terrasse, test-cross, testcross, tomas, trail boss, twycross, uncross, vandross, vanoss, veloce, vsauce, warcross, waycross, white sauce, wine sauce

3 syllables:
after-grass, aftergrass, ahnenpass, alpha brass, andre de grasse, arrowgrass, arrow grass, autopass, barley grass, barnyard grass, bearing brass, bierglas, bio-mass, black sea bass, blowing gas, boardingpass, boarding pass, botopass, bottle-grass, bottled gas, bottlegrass, bottle grass, brandy glass, bristlegrass, bristle grass, broom beard grass, burning-glass, cabin class, candlemas, candlemass, candy-ass, carpet grass, cartridge brass, channel bass, china grass, code geass, cotton-grass, cotton grass, curly grass, curtelasse, dallisgrass, demi-tasse, devil grass, double-bass, double bass, drinking glass, efficace, energas, english class, europass, fescue grass, fiberglas, fiberglass, fibreglass, figured bass, finger grass, forward pass, fountain grass, foxtail grass, freshman class, galloglass, gallowglass, gangstagrass, goosegrass, grama grass, hardinggrass, harding grass, hippocras, hoppergrass, hour-glass, hourglass, ideal gas, inert gas, interclass, ipocras, isinglass, itar-tass, jenny-ass, jenny ass, johnsongrass, junior class, kylie masse, laughing gas, lemongrass, liqueur glass, looking-glass, looking glass, lower-class, lower class, madecass, manna grass, mardi gras, mark duplass, martinmas, masterclass, meadow-grass, meadowgrass, meadow grass, metaclass, middle-class, middleclass, middlemas, middle class, montparnasse, motorbass, mountain pass, moviepass, mustard gas, naval brass, noble gas, object glass, old witch grass, opal glass, orange grass, orchard grass, overclass, overpass, pampas grass, pane of glass, panic grass, penny grass, peppergrass, pepper grass, perfect gas, perspicace, physics class, piece of ass, plexiglas, plexiglass, poison gas, prairie grass, psycho-pass, push-to-pass, quatermass, rankin/bass, ravenglass, ribbon grass, ripple-grass, rock sea bass, ruling class, safety glass, salt reed grass, sassafras, sassafrass, scurvy-grass, sea lyme grass, second-class, second class, senior class, sewer gas, shangri-las, sheet of glass, silver grass, social class, sonderclass, sophomore class, sour grass, sparagrass, sparrowgrass, superclass, supergrass, tall oat grass, tarantass, thorough-bass, thorough bass, throne of glass, tourist class, tumble grass, underclass, underpass, untertasse, upper-class, upperclass, upper class, velvet grass, water gas, water glass, weatherglass, weierstrass, whitlow grass, wild oat grass, windmill grass, wire glass, wire grass, wiseass, working-class, working class, xbox game pass, xmass, yellow bass, ypocras, adin ross, albatross, applecross, applesauce, apple sauce, april ross, arctic moss, arkansass, aruldoss, at a loss, auchincloss, autocross, barabbas, betsy ross, candyass, candyfloss, caper sauce, celtic cross, chihuahuas, chili sauce, chocolate sauce, cocktail sauce, come across, contrebasse, curry sauce, cut across, cyclo-cross, cyclocross, demitasse, dental floss, desmond doss, double-cross, doublecross, double cross, fairyfloss, floating-moss, garlic sauce, genus bos, get across, go across, hearing loss, helios, holycross, hugo boss, hunter's sauce, iceland moss, intercross, irish moss, isogloss, karakos, katharine ross, kephalos, kyla ross, ladislaus, latin cross, lazyass, leineschloss, look across, lorraine cross, maltese cross, market cross, motocross, mushroom sauce, mustard sauce, navy cross, neuromas, newburg sauce, northern cross, omahas, omphalos, papal cross, paraguas, party boss, pass across, pasta sauce, pepper sauce, phelios, piraguas, pitch-and-toss, polocrosse, precognosce, put across, rallycross, randolph ross, recognosce, reindeer moss, run across, sarah knauss, seafood sauce, semi-gloss, semigloss, single-cross, sint-niklaas, southern cross, spanish moss, srinivas, stanislaus, stelios, stonetoss, supercross, taco sauce, tartar sauce, underboss, virtuos, wenceslaus

4 syllables:
africa/brass, alkali grass, amerigas, atomic mass, bahama grass, bahia grass, bermuda grass, buffalo grass, canary-grass, canary grass, center of mass, cereal grass, chemistry class, creeping soft grass, crested wheat grass, domestic ass, ecclesiastes, egyptian grass, evergreen grass, feather reed grass, freshwater bass, giant star grass, immigrant class, inertial mass, itaewon class, joey badass, lateral pass, laughing jackass, levy en masse, major form class, manila grass, natural gas, natural glass, optical glass, pain in the ass, poverty grass, producer gas, ravenna grass, reed meadow grass, scorpion-grass, sergeant first class, shatterproof glass, snake in the grass, soluble glass, spotted black bass, sunday school class, tall meadow grass, timothy-grass, velvet bent grass, venetian glass, volcanic glass, water star grass, weeping love grass, abul-abbas, anchovy sauce, apricot sauce, atticus ross, barbecue sauce, bourguignon sauce, brown onion sauce, bucephalos, burgundy sauce, calvary cross, capital loss, carrickmacross, carrie-anne moss, charity toss, chinese brown sauce, cirsomphalos, cranberry sauce, encephalos, exomphalos, financial loss, helluva boss, horseradish sauce, insane clown posse, little club moss, lyonnaise sauce, marion ross, memory loss, mushroom win sauce, paprika sauce, profit and loss, put one across, sign of the cross, spaghetti sauce, tabasco sauce, tomato sauce, white onion sauce

5 syllables:
admiralty brass, african love grass, african wild ass, alligator grass, australian reed grass, biology class, christopher mintz-plasse, common cotton grass, creeping windmill grass, economyclass, genus sassafras, graduating class, hairy finger grass, hungarian grass, japanese lawn grass, kentucky black bass, kentucky bluegrass, korean lawn grass, laminated glass, lower-middle-class, magnifying glass, mercedes-benz c-class, mercedes-benz e-class, mercedes-benz g-class, mercedes-benz s-class, mercedes-benz sl-class, pheasant under glass, reed canary grass, through the looking-glass, upper-lower-class, upper-middle-class, yellow bristle grass, betsy griscom ross, elisabeth moss, hungarian sauce, jerusalem cross, low st andrew's cross, patriarchal cross, political boss, stations of the cross, tracee ellis ross, tyler winklevoss, victoria cross

6 syllables:
american star grass, carbon monoxide gas, conservation of mass, continuing trespass, coronary bypass, european dune grass, fairway crested wheat grass, gravitational mass, japanese carpet grass, korean velvet grass, mercedes-benz a-class, midnight in the switchgrass, relativistic mass, cameron winklevoss, conductive hearing loss, distinguished flying cross, distinguished service cross, murder of polly klaas, wandering albatross

7 syllables:
interplanetary gas, relative atomic mass, bolognese pasta sauce

8 syllables:
law of conservation of mass, liquefied petroleum gas, relative molecular mass

1 syllable:
spots, shots, bats, cats, scots, rats, katz, watts, pots, lots, dots, spats, knots, hats, flats, fats, nots, plots, potts, slots, pat's, that's

2 syllables:
culottes, and that's

3 syllables:
casting lots, drawing lots