Or search: visual, ocular, panoptic, viewable, subgross, telescopic, megascopic, microscopic, perceptible, circumpolar, macroscopic, macroscopical, microscopical
1 Syllable: S
bulb, bulge, bulk, cul, cull, cult, curl, dull, Earl, Earle, Earls, girl, gulf, gull, gulp, hulk, Hull, hurl, lull, Mull, null, pearl, pulp, pulse, skull, sul, swirl, whirl, will, world
2 Syllables: SU
adult, impulse, insult
2 Syllables: US
Biol, consult, convulsed, divulge, engulf, exult, indulge, occult, repulse, result, unfurled
3 Syllables: SUU
amiable, enviable, feasible, malleable, miracle, peaceable, permeable, pitiable, readable, reasonable, regional, seasonal, variable
3 Syllables: UUS
agreeable, foreseeable
4 Syllables: USUU
amenable, appreciable, conceivable, invariable, procedural, satirical, unenviable, unreasonable, unspeakable
4 Syllables: UUUS
disagreeable
5 Syllables: UUSUU
inconceivable, irremediable, irretrievable, unbelievable, unimpeachable

Found 74 words across 8 groupings. Skipped 31 excess words of a similar stem.