Or search: beneficent, benevolent, sympathetic, eleemosynary, philanthropic
3 Syllables: SUU
fashionable, preferable
4 Syllables: SUUU
applicable, creditable, eligible, equitable, estimable, habitable, irritable, marketable, measurable, memorable, navigable, negligible, palatable, pleasurable, profitable, reputable, separable, venerable
5 Syllables: USUUU
attributable, disreputable, imaginable, impenetrable, impressionable, indomitable, inequitable, inestimable, inevitable, inimitable, inseparable, intelligible, irrefragable, irreparable, irrevocable, unfashionable, unfathomable, unpalatable
6 Syllables: UUSUUU
ineradicable, uninhabitable, unintelligible

Found 41 words across 4 groupings.