Or search: scalar, symbol, vector, tensor, polaris, protean, variant, shifting, adaptable, correlate, unsettled, versatile, covariant, inconstant, correlative
3 Syllables: SUU
amiable, bearable, cerebral, clerical, enviable, germinal, malleable, parable, permeable, pitiable, terrible, variables
3 Syllables: UUS
agreeable, foreseeable
4 Syllables: USUU
chimerical, invariable, numerical, referable, unbearable, unenviable
4 Syllables: UUUS
disagreeable
5 Syllables: UUSUU
imperturbable, irremediable

Found 23 words across 5 groupings. Skipped 1 excess word of a similar stem.