Or search: abysmal, abyssal, unsoundable, incomprehensible, uncomprehensible
3 Syllables: SUU
fashionable
4 Syllables: SUUU
applicable, charitable, estimable, habitable, navigable, palatable
5 Syllables: USUUU
imaginable, inestimable, unfashionable, unpalatable
6 Syllables: UUSUUU
ineradicable, uninhabitable

Found 13 words across 4 groupings.