1 syllable:
bloop, boop, cloop, coop, coupe, croop, croup, croupe, d-loop, dhoop, doupe, droop, drupe, dupe, floop, froop, gloop, goop, groupe, grupe, hoop, houp, hupe, knoop, koop, loop, loope, loup, loupe, lupe, mvgroup, oop, p-group, p-to-p, poop, r-loop, roop, roope, roupe, rupe, scoop, scoup, scroop, shoop, shoup, shoupe, shupe, sloop, sloup, snoop, soup, soupe, sqoop, stoop, stoup, stroop, stroope, stroup, stroupe, stupe, swoop, swoope, t-group, throop, toupe, troop, troup, troupe, whoop

2 syllables:
500px, age-group, aggroup, amx-10p, arrupe, arup, astoop, boskoop, calgroup, closed-loop, deathloop, duck soup, eastgroup, ecoop, firstgroup, ground loop, hadoop, hencoop, in-group, ingroup, inhoop, loop-the-loop, loup-loup, mslgroup, newsfroup, newsgroup, oddloop, out-group, outgroup, pagegroup, pea soup, playgroup, psy-group, recoup, recoupe, redhoop, regroup, saloop, scoopwhoop, scout troop, self-coup, siroop, stem-loop, strongloop, subgroup, sungroup, unhoop, verloop, vingroup, waldroop, waldroup, war whoop, workgroup, wynkoop, zeitlupe

3 syllables:
1440p, alley-oop, alleyoop, aptargroup, aqualoop, armorgroup, bioscoop, busy-loop, chicken coop, chicken soup, citigroup, cock-a-hoop, contrecoup, countercoup, dpdgroup, easygroup, eneloop, eurogroup, green pea soup, guadalupe, guadeloupe, haplogroup, hula-hoop, hyperloop, intergroup, intragroup, jappeloup, keetmanshoop, lentil soup, liripoop, make a scoop, medisgroup, multigroup, nincompoop, noah jupe, outside-group, overloop, paratroop, pseudocroup, pultegroup, quasigroup, semigroup, serogroup, supergroup, trou-de-loup, trous-de-loup, turtle soup

4 syllables:
2160p, arianegroup, basketball hoop, c0-semigroup, green turtle soup, human-in-the-loop, interest-group, manpowergroup, meteogroup, mock turtle soup, tales from the loop, vegetable soup

5 syllables:
embroidery hoop

8 syllables:
our lady of guadalupe

1 syllable:
rube, cube, tube, lube, boob

2 syllables:
stock cube, sieve tube, test tube, ice cube, boob tube, blowtube, blow tube

3 syllables:
picture tube, geiger tube, pollen tube, x-ray tube, static tube, inner tube, speaking tube, vacuum tube, acorn tube, color tube, counter tube, neon tube, rear of tube

4 syllables:
bouillon cube, bronchial tube, venturi tube, electron tube, torpedo tube, uterine tube, cathode-ray tube, digestive tube

5 syllables:
fallopian tube, capillary tube, eustachian tube, auditory tube, boron counter tube, color tv tube, rectifying tube, television tube

6 syllables:
ionization tube

7 syllables:
color television tube, proportional counter tube, television pickup tube