1 syllable:
ad, add, bad, brad, brl-cad, cad, cadde, chad, chadd, clad, d-pad, dad, dradde, fad, flad, gad, gadd, glad, gladd, grad, gradd, had, hadd, hlad, khad, lad, ladd, ladde, mad, madd, nad, ncadd, p-cad, pad, plaid, quad-, rad, radde, sad, scad, schad, shad, shadd, shadde, sprad, spradde, stadd, strad, tad, tadd, thad, tradd, vlad

2 syllables:
accad, aicad, alclad, all-clad, amstrad, and had, ar-ra'd, armstrad, arm pad, arvad, audad, ayyad, bedad, begad, behadd, blacksad, blutbad, branstad, bricscad, cathbad, chabad, codad, comrade, cookpad, coolpad, copad, crawdad, cuidad, cycad, dampfbad, decad, dextrad, dhanbad, dhrupad, do-dad, doodad, drvengrad, dryad, dyad, ecad, eckblad, ectad, ekblad, entad, ershad, farhad, fatlad, feel-bad, fnulad, footpad, forbad, freecad, frontad, full-clad, gamepad, geekdad, go bad, grabcad, grandad, granddad, halmstad, harad, heathclad, heptad, hexad, hip pad, holcad, hot pad, humedad, huzzaed, igadd, imdad, inkpad, ipad, i had, johad, josh gad, joypad, keypad, kicad, kjenstad, kneepad, knee pad, kvistad, lake chad, launchpad, launch pad, leafpad, leappad, lenkrad, like mad, mail-clad, mailclad, maldad, manpad, mathcad, medad, mirad, mirsad, mongstad, mossad, mouse pad, narsad, nawcad, ni-cad, nicad, nomad, nomade, notepad, not bad, octad, pentad, piedad, pindad, pine-clad, postgrad, randstad, razgrad, reclad, retad, retrad, riyad, riyadh, round scad, rug pad, sadad, schildpad, scratchpad, scratch pad, shabad, shahrzad, shinpad, sinbad, sindbad, sketchpad, sketch pad, skidpad, skyclad, snow-clad, soap pad, soledad, springpad, stamp pad, steel-clad, stepdad, tempad, tetrad, thappad, they had, thigh pad, thinkpad, tongue-pad, too bad, touchpad, trackpad, transcad, triad, triclad, tsargrad, unclad, unctad, unsad, verdad, vine-clad, vorad, want ad, wattpad, wildbad, wordpad, wrist pad, yclad, ydrad, zedad, zwembad, zycad

3 syllables:
alidad, allis shad, almodad, almohad, amistad, anabad, angharad, aoudad, aqualad, ariad, armor-clad, armour-clad, ashkhabad, autocad, autorad, blagoevgrad, body pad, bosilegrad, breaking bad, calidad, caridad, carpet pad, cephalad, ciudad, cleaning pad, compuadd, dark triad, deadbeat dad, densidad, diane ladd, dignidad, elbow pad, etherpad, facultad, featherpad, fetch-and-add, galahad, gamzigrad, hasselblad, heating pad, helipad, henadad, hermandad, ideapad, igualdad, innistrad, ironclad, iron lad, isograd, jotterpad, kettenkrad, khongirad, khuldabad, launching pad, leningrad, libertad, librecad, lily pad, magistad, maligrad, manapad, marienbad, mattress pad, medelpad, messagepad, message pad, miandad, naukograd, novogrod, octodad, openscad, overglad, petrograd, phylloclad, polyclad, pratapgad, rapidcad, raving mad, realidad, river shad, sajid-farhad, semiclad, shamshabad, shoulder pad, sinhagad, sinistrad, sociedad, stalingrad, superadd, superdad, svilengrad, tinkercad, trinidad, tvpad, undergrad, unidad, unilad, vanidad, variedad, velingrad, vendidad, visegrad, volgograd, voluntad, writing pad, zindabad

4 syllables:
adversidad, ahmadabad, ahmedabad, autoridad, capacidad, comodidad, comunidad, dificultad, dimitrovgrad, eternidad, facilidad, faridabad, farrukhabad, fidelidad, fraternidad, habilidad, hamadryad, hispanidad, humanidad, hyderabad, integridad, intensidad, intimidad, kalapahad, kaliningrad, kirovograd, kirovohrad, latinidad, mackerel scad, mackerel shad, moradabad, murshidabad, newspaper ad, olympiad, olympiade, olympiads, oscuridad, profundidad, real sociedad, rich dad poor dad, scantily clad, scouring pad, seguridad, sir galahad, stalinogrod, theodahad, tomislavgrad, velocidad

5 syllables:
capital of chad, electricidad, elisavetgrad, humancentipad, personalidad, posibilidad, probabilidad, secunderabad, siege of leningrad, solidaridad, universidad, voroshilovgrad, yelisavetgrad, yelizavetgrad

6 syllables:
battle of stalingrad, pfc ludogorets razgrad, responsabilidad

7 syllables:
common american shad

2 syllables:
jassid, placid, acid, avid, aphid

3 syllables:
bile acid, antacid

4 syllables:
uric acid, lactic acid, citric acid, gallic acid, stearic acid, boric acid, fatty acid, folic acid, nitric acid, pectic acid, nitrous acid, formic acid

5 syllables:
titanic acid, glycolic acid, perchloric acid, amino acid, sulfuric acid, ascorbic acid, acrylic acid, phosphorous acid, phosphoric acid, battery acid, arsenic acid, hydroxy acid, acetic acid, palmitic acid, glutamic acid, nucleic acid

6 syllables:
propionic acid, cyanuric acid, periodic acid

7 syllables:
hyaluronic acid

8 syllables:
saturated fatty acid, essential amino acid

9 syllables:
unsaturated fatty acid

10 syllables:
deoxyribonucleic acid