2 syllables:
bestar, bester, brester, chester, crestor, ester, esther, estre, eszter, fester, hester, jester, kester, leicester, lester, lestr, maestre, mester, mestre, nester, nestor, pester, pressed her, prester, quaestor, questar, quester, questor, rester, schwester, sester, tester, testor, trester, vestar, vester, westar, wester, wrester, yester, yester-, zester

3 syllables:
addressed her, amvestor, ancestor, antestor, arrester, arrestor, attester, attestor, bimester, bourgmestre, caressed her, colchester, contester, detestar, detester, digester, digestor, dorchester, enfester, expressed her, grantchester, impester, infester, investor, ivester, john lester, jon lester, lanchester, manchester, mclester, molestar, molester, northwester, norwester, portchester, protester, protestor, requester, requestor, ribchester, rochester, rupestre, semester, semestre, sequester, silchester, silvester, sou'wester, southwester, suggester, sylvester, sylvestre, taste-tester, terrestre, trimester, undressed her, webmestre, wenchester, westchester, winchester, worchester

4 syllables:
.308 winchester, arbalester, audrey mestre, bankworcester, child molester, earl of leicester, genus nestor, godmanchester, krankenschwester, manifester, mcalester, overpester, polyester, tastetester, thioester, toy manchester, veeblefester

5 syllables:
cellulose ester, copolyester, extraterrestre

6 syllables:
corporate investor

9 syllables:
university of manchester

2 syllables:
eschar, metzger