Or search: fickle, unstable, chemistry, explosive, changeful, vaporific, evaporable, inconstant, vapourific, vaporizable, vapourisable, volatilisable, volatilizable
3 Syllables: SUU
audible, doggerel, laudable, nautical, nominal, plausible, possible, probable, soluble, topical, voluble
4 Syllables: USUU
abdominal, apocryphal, canonical, impossible, improbable, inaudible, inaugural, insoluble, methodical, phenomenal
5 Syllables: UUSUU
indissoluble, inexhaustible
6 Syllables: UUUSUU
anthropological, etymological

Found 25 words across 4 groupings.