Or search: modify, polish, refine, educate, civilise, sophisticate
3 Syllables: SUU
realising, realizing
4 Syllables: SUUU
analyzing, equalizing, fertilizing, generalizing, minimizing, mobilizing, moralizing, neutralizing, paralyzing, specializing, stabilizing, symbolizing, tantalizing, utilizing, vivifying
5 Syllables: USUUU
demoralizing

Found 18 words across 3 groupings.