1 syllable:
'gain, behn, behne, ben, benn, benne, bren, brenn, brenne, chen, chien, dehn, dehne, den, denn, denne, drehen, en, fehn, fen, fenn, gen, gen-x, glen, glenn, gren, gwen, gwenn, hehn, hen, henn, henne, hren, jen, jenn, jenne, kehn, kehne, ken, kenn, kenne, kren, krenn, lehn, lehne, len, men, menn, menne, mesne, n, n., pen, penh, penn, penne, phen, prehn, prenn, rehn, ren, renn, renne, schwenn, sen, senn, senne, shen, splen, splen-, sten, sven, sweyn, ten, tenn, tenne, thegn, then, tien, venn, venne, wen, when, wrenn, yen, yene, zen

2 syllables:
(paren, )paren, achtzehn, adren, advene, again, aiden, aidenn, airmen, almen, alpen, amen, and then, antenne, askmen, aufsehen, aussehen, bagmen, ballpen, beaubien, beauchesne, behen, bienne, big ben, brienne, brood hen, bruntjen, bullpen, but then, cayenne, chang chen, cheyenne, chienne, chretien, chris fehn, conmen, courchesne, cow pen, culmen, delenn, demesne, derouen, drakkhen, dreizehn, duchenne, duchesne, dufresne, eghen, elsewhen, eugen, fat hen, fengtien, fernsehen, filmen, flagmen, fulmen, gatemen, gerzean, grayhen, gray hen, greyhen, guienne, gunmen, guyenne, heath hen, holpen, hotien, ilmen, impen, inguen, jiawen, john glenn, kal penn, kroatien, landmen, larchen, lawmen, legmen, light pen, longden, lumpen, lunen, luxgen, magten, mahen, mailmen, maintien, marchen, maren, marsh hen, mayenne, mehen, meighen, ming-jen, moor-hen, moorhen, mud hen, neunzehn, nexgen, nguyen, northglenn, oilmen, panchen, paren, penmen, perenne, phen-fen, phenfen, phnom penh, pitchmen, playpen, pnom-penh, po-jen, protien, qichen, quill pen, rechen, reten, reynmen, sage hen, saint-ouen, salmen, sandmen, sayen, schoolmen, scott glenn, sea pen, sechzehn, sheep pen, sheng-fen, sheng-yen, shenzhen, sheyenne, siebzehn, somewhen, soutien, spanien, sparen, steve chen, strawmen, swagmen, take ten, tegmen, teng-wen, transenne, turkmen, u. n., umgehen, unten, upenn, uren, urgen, versehen, vienne, vierzehn, vorgehen, wheelmen, wise men, wood hen, woolmen, wuzhen, xue chen, yuen, zak penn

3 syllables:
(left-paren, )close-paren, )end-paren, )right-paren, abdrehen, adrienne, afscn, almaden, anchormen, angehen, angesehen, antwerpen, anywhen, arfcn, arienne, aufstehen, b.j. penn, ballpoint pen, biel/bienne, biogen, bisdn, bonchretien, born-again, broody hen, businessmen, c. n. n., cattle pen, choukoutien, chou tien-chen, clergymen, cnn, codepen, colormen, councilmen, countermen, cryogen, dandy-hen, darlehen, draisienne, duramen, dylan penn, dynapen, eintreten, emu-wren, energen, entretien, euroyen, fabienne, fill again, five-and-ten, fountain pen, fudepen, gebrochen, georgien, georgienne, geschehen, guinea-hen, guinea hen, hambleden, handymen, haslingden, haute-vienne, henequen, iain glen, indienne, innichen, iogen, ironmen, itelmen, jianzhen, julianne, julienne, jungle hen, kelaguen, kungsholmen, legumen, lesbienne, lingayen, lpn, m. f. n., madeleine, maori hen, marine le pen, metalmen, michael penn, middlemen, miniten, minutemen, mirabehn, molimen, motormen, mussulmen, nathan chen, neupogen, now and then, once again, only when, patrolmen, persienne, powergen, pushed again, repairmen, sagapen, saracen, sdn, sebastien, setting hen, signalmen, synergen, tappit-hen, tavernmen, then again, thereagain, tibicen, tienanmen, uniden, vannguyen, verstehen, waterhen, water hen, weathermen

4 syllables:
)end-the-paren, 18 again, b-isdn, bjaodn, boumedienne, canadien, canadienne, comedienne, cracovienne, e. s. p. n., environment', equestrienne, erythrophleine, gambling den, immunogen, kalifornien, kimiko glenn, knin, mazedonien, melanogen, msisdn, n-isdn, never again, now and again, obesogen, opium den, organogen, over again, parisien, parisienne, pepsinogen, rock cornish hen, sebastiane, see you again, sherilyn fenn, sicilienne, thieboudienne, tiananmen, time and again, toshimaen, tragedienne, tyrolienne, valencienne, valravn, varsovienne, vlaanderen

5 syllables:
again and again, asean, auseinandergehen, cnnfn, euro-isdn, expressvpn, kemono jihen, kobenhavn, mother carey's hen, nflpn, nordvpn, opencpn, openvpn, protonvpn, purevpn, stdin, time and time again, valerie constien, victor osimhen

6 syllables:
anna van bellinghen, bootstrapcdn, cap-de-la-madeleine, every now and then, paracyanogen, sulphocyanogen, thiocyanogen

7 syllables:
johnny english strikes again, never say never again, over and over again, persulphocyanogen, perthiocyanogen, youngboy never broke again