2 syllables:
ass in, bason, bassen, bassin, basson, bass in, blason, brasen, brassen, brassin, casin, cason, cassin, casson, chasin, chason, clason, classen, classon, class in, dassin, fascin, fascine, fason, fassen, fasten, gassen, gassin, gas in, glassen, glasson, glass in, grass in, hassen, hasson, jasin, jassen, kasen, kasin, kassan, kassen, kassin, kasson, klassen, lassan, lassen, masson, mass in, nasen, nason, pasan, pasin, passen, passon, pass in, plasson, quassin, rasin, rason, sasan, sasin, stassen, tassin, yasin, yassin

3 syllables:
ablassen, alhacen, assasin, assassin, carassin, cerasin, chanhassen, damassin, entlasten, erfassen, fantassin, kerasin, magasin, marcassin, mcglasson, paillasson, pengassan, pulasan, pulassan, refasten, sarrasin, tenascin, unfasten

4 syllables:
antimason, aromasin, ausgelassen, bandjarmasin, bandjermasin, banjermasin, biliprasin, diapason, einlassen, sannyasin, sifan hassan, spamassassin

5 syllables:
cytochalasin, muhyiddin yassin

7 syllables:
american assassin

2 syllables:
pavane, haven't, passion, ashen, pathan, fashion, ration

3 syllables:
refashion, high fashion, dispassion, agnathan, compassion, field ration, relafen

4 syllables:
riboflavin, circassian, lactoflavin, out of fashion, with compassion