Here's what rhymes with grater.
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labor aber grader raider raper nature major paper neighbor vapor trader taper sabre wager nadir saber scraper caper draper pager tabor wader wagerer crusader belabor evader staider invader denature blockader persuader masquerader legislature nomenclature layer acre laser agar glacier razor aver graver raiser racer grayer greyer grazer lamer raver claimer favor favour player maker mayor painter flavor safer sailor tailor breaker flavour labourer planar tracer trailer trainer wafer waiver baker fainter savor savour seiner taker baser braver hacer jailer maner payer plainer ranger saver shaker slayer waver atelier blazer chaser eraser gainer gayer maser planer saner slaver tamer vaguer whaler bather framer jailor mailer pacer quaver shaver taster waster baler faker frailer gamer hazer bracer chaster drainer quainter vainer baster caver fayer sager elver caner haler wailer fainer danger failure chamber scalar engraver manger retainer savior appraiser bilayer changer papier spacer strainer arranger sprayer assayer declaimer essayer stayer staler delayer loudhailer opaquer wavier urbaner waylayer inaner remainder stranger container surveyor conveyor attainder disclaimer purveyor betrayer campaigner inhaler partaker conveyer gamester modeller complainer poetaster statelier cockchafer defamer humaner programer gainsayer naysayer saltshaker defacer insaner unsafer behavior endanger exchanger monolayer disfavor disfavour soothsayer abstainer automaker boilermaker restrainer doomsayer finagler entertainer multilayer undertaker moneymaker semiquaver semitrailer boneshaker astuter troublemaker policymaker multiplayer photoengraver misbehavior cabinetmaker