Or search: analytic, illative, deducible, analytical, inferential
2 Syllables: SU
bloodless, buttress, Douglas, luckless, luggage, Putnam's, troublous, ugliest
3 Syllables: USU
abruptness, constructions, corruptions, deductions, eruptions, instructions, obstructions, productions, reductions, seductions
4 Syllables: UUSU
interruptions, introductions, reproductions

Found 21 words across 3 groupings. Skipped 2 excess words of a similar stem.