1 syllable:
ben's, benz, benz-, brens, chen's, cleanse, dens, denz, ennes, enns, enz, flens, frenz, friend's, friends, friends', gennes, gens, genz, glenn's, glenns, glens, grenz, grenze, hen's, hennes, hens, henze, jenn's, jens, ken's, krenz, lens, lenz, men's, mens, menz, menze, n's, n.'s, n.s, n.s.w, ouens, pen's, penh's, penn's, penns, pens, pens', rennes, rens, renz, sens, spends, stenz, ten's, tens, thegns, trends, wednes, wenz, when's, whennes, whens, wrens, yen's, zens, zenz

2 syllables:
(parens, )parens, ardennes, boyfriends, bullpens, cheyenne's, cheyennes, contends, crescens, crown lens, extenze, firenze, florenz, frequenz, fulgens, impennes, ingens, marennes, parens, playpens, potenz, suresnes, tendenz, urgen's, zoom lens

3 syllables:
)end-parens, biogen's, c. n. n.'s, c. n. n.s, closeup lens, cnn's, compound lens, concave lens, contact lens, convex lens, deferens, differenz, erkelenz, existenz, gentlemen's, genus lens, google lens, konferenz, kongruenz, konsequenz, longipennes, louvre-lens, madeleines, portrait lens, semilens, squamipennes, synergen's, uniden's

4 syllables:
(begin-parens, camera lens, comediennes, converging lens, crystalline lens, diverging lens, efavirenz, electron lens, intelligenz, optical lens, parisiennes, tragediennes, valenciennes

5 syllables:
pressekonferenz, telephoto lens

6 syllables:
intraocular lens

1 syllable:
stems, thames, m.'s

3 syllables:
i. b. m.'s