Invalidate rhymes with:
consolidate, consolidate, intimidate, liquidate, mithridate, multicandidate, accommodate, backdate, consolidate, dilapidate, elucidate, intimidate, inundate, liquidate, mandate, mithridate, multicandidate, outdate
Invalidate sounds like:
immobility, impaled, impelled, implied, implode, imploded, impolite, inability, infield, inflate, inflated, invalid, invalidated, inviolate