Or search: math, maths, linear, addable, addible, adjuvant, bilinear, improver, summative, completing, incremental, mathematics, intercalary, summational, accumulative
3 Syllables: SUU
averages, cabbages, carriages, damages, manages, packages, parishes, passages, ravages, savages, vanishes
4 Syllables: USUU
establishes, imaginings

Found 13 words across 2 groupings.