Overactive rhymes with:
hyperactive, interactive, active, attractive, hyperactive, inactive, interactive, photorefractive, proactive, radioactive, reactive, refractive, retroactive, unattractive
Overactive sounds like:
overstaff, overstep, overstuff
hyperactive, interactive, active, attractive, hyperactive, inactive, interactive, photorefractive, proactive, radioactive, reactive, refractive, retroactive, unattractive
overstaff, overstep, overstuff