Or search: regress, rational, illation, deduction, inference, synthesis, mentation, prevision, conjecture, prediction, cerebration, anticipation, argumentation, ratiocination
2 Syllables: SU
realism
3 Syllables: SUU
deepening, equalling, featuring, frequenting, peopling, reasonings, seasoning, secreting, weakening

Found 10 words across 2 groupings.