2 syllables:
besar, besor, besser, blesser, bless her, bresser, cesser, cessor, chesser, dresser, dresseur, esser, fesser, fresser, gresser, guesser, hesser, jesser, jessore, kesar, kresser, leser, lesser, lessor, loesser, messer, messr, nesser, pesar, plessor, presser, pressor, press her, schlesser, sesar, sesser, specer, stressor, tessar, tresor, tresser, vesser, yes sir

3 syllables:
abaisser, accessor, addresser, addressor, adresser, aggressor, agresser, agresseur, agressor, assesseur, assessor, beckmesser, bergstresser, caresser, caress her, co-lessor, compresser, compressor, confesar, confesser, confesseur, confessor, cross-dresser, depressor, digresser, egressor, expresser, express her, fluorescer, hairdresser, impresser, impressor, impress her, insessor, kolesar, kompressor, landmesser, lopressor, manesar, obsessor, oppressor, possessor, precessor, processor, prof., profesor, professeur, professor, professore, progresar, redresser, redressor, regressor, relessor, represser, repressor, sublessor, successeur, successor, suppresser, suppressor, thanesar, transgressor, undress her

4 syllables:
abastecer, aborrecer, acquiescer, air compressor, antecessor, apetecer, buttermesser, co-assessor, co-processor, coalescer, corepressor, decompressor, dispossessor, food processor, full professor, intercessor, predecessor, prepossessor, repossessor, second-guesser, spike suppressor, surge suppressor, tax assessor, vasopressor, window-dresser, window dresser, word processor

5 syllables:
central processor, data processor, english professor, moto-compressor, multi-processor, multiprocessor, underpossessor, uniprocessor, vasodepressor

6 syllables:
assistant professor, homo antecessor, immunosuppressor, multi-core processor, visiting professor

7 syllables:
associate professor

3 syllables:
kieselguhr, skydiver, five-finger, diesinker