Doubtfire's rhymes with:
doubtfires, doubtfires, doubtfires, ceasefires, doubtfires, fire's, fires, acquires, aspires, ayers, bryars, buyer's, buyers, buyers', byars, byers, byers', ceasefires, desires, doubtfires, dryers, expires, fire's, fires, fliers, flyers, friars, fryers, grier's, hires, hyers, i'ers, inquires, liars, meier's, meyer's, meyers, miers, myers, pliers, priors, pryor's, pyres, requires, smyers, spiers, squiers, squires, stiers, styers, supplier's, suppliers, suppliers', swyers, syers, tires, transpires, viars, wires, wyers