Or search: admirable, honorable, reputable, calculable, computable, respectable
3 Syllables: SUU
preferable
4 Syllables: SUUU
charitable, creditable, eligible, equitable, measurable, memorable, negligible, pleasurable, questionable, separable, venerable
5 Syllables: USUUU
impenetrable, impressionable, inequitable, inestimable, inevitable, inseparable, intelligible, irrefragable, irreparable, irrevocable, unfathomable, unquestionable
6 Syllables: UUSUUU
unintelligible

Found 25 words across 4 groupings.