Here's what rhymes with ostast.
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chafed paved bathed dazed raised saved gazed praised waved blazed shaved phased phrased vouchsafed waived braved raved razed amazed behaved glazed appraised craved crazed grazed upraised depraved enslaved unscathed engraved paraphrased state date paint bait baked taint staked taped pate spate late rate straight weight estate fate gate plate shaped wait faint hate freight mate saint trait acetate gait slate draped raped strait abate fete raked sate aspirate caked faked feint gaped plaint plait sedate skate upstate waked great separate debate operate escaped await innate quaint update grate ornate scraped situate agitate crate dilate obviate irate oscillate restate saturate create generate relate hesitate restraint tolerate activate dictate educate imitate isolate mediate postulate acquaint allocate decorate deviate equate liberate navigate ordinate overweight dissipate evaporate irritate lightweight negate permeate abdicate automate expiate fascinate gravitate inflate overstate reshaped urinate venerate vitiate indicate complaint illustrate accommodate carbonate celebrate constraint cultivate dominate initiate magistrate alleviate cooperate correlate delegate interstate originate terminate conjugate dedicate elevate elucidate exaggerate meditate mitigate motivate vertebrate affiliate aggravate assassinate corroborate distillate emanate exacerbate germinate neonate reiterate abrogate arbitrate authenticate calibrate emancipate escalate extirpate fabricate heavyweight innovate instigate insulate irrigate militate obligate officiate perpetrate reinstate resonate subjugate videotaped appreciate concentrate evaluate facilitate participate anticipate compensate incorporate negotiate penetrate stimulate translate accelerate designate integrate predicate speculate assimilate circulate collaborate complicate delineate emulate enumerate eradicate evacuate necessitate propagate replicate alienate annihilate condensate consecrate culminate emigrate extricate fluctuate invalidate legislate liquidate obliterate profligate recreate regenerate retaliate stipulate adjudicate attenuate confiscate counterweight deprecate episcopate excavate exonerate demonstrate eliminate investigate subordinate calculate precipitate regulate articulate contemplate formulate perpetuate commemorate consolidate deteriorate determinate underestimate ameliorate conciliate congregate disseminate expatriate exterminate inculcate intimidate overestimate proliferate repudiate differentiate manipulate predominate substantiate disintegrate rehabilitate communicate accumulate discriminate congratulate