Or search: bite, decrease, discount, illation, allowance, exemption, inference, reasoning, synthesis, syllogism, adjustment, diminution, entailment, implication, subtraction
2 Syllables: SU
button, buxom, Buxton, duction, Dutton, glutton, Hudson, Hudson's, Hutton, mutton, Putnam, Putnam's, Rutland, substance, suction, sudden, suppliant, Sutton, twopence, upland, Upton
3 Syllables: USU
abduction, adjustment, conduction, construction, corruption, deductions, destruction, disruption, eruption, induction, instruction, irruption, obstruction, production, readjustment, reduction, reluctance, reluctant, repugnance, repugnant, seduction
4 Syllables: UUSU
interruption, introduction, reconstruction, reproduction

Found 46 words across 3 groupings. Skipped 15 excess words of a similar stem.