Or search: spay, neuter, operate, disinfect, sterilise, vasectomise, vasectomize, desexualise, demasculinise, demasculinize
3 Syllables: SUU
Caroline, clarifies, mechanized, memorize, paradigms, paralyze, specialised, specialize, specifies, sterilized

Found 10 words across 1 groupings. Skipped 3 excess words of a similar stem.