Here's what rhymes with astheir.
their there fair hair share fare faire hare cher fere sehr where care bear chair pair prayer rare wear affair bare dare spare swear tear mare stare ware flare mer pear scare snare stair flair guerre lair mehr affaire mair pare thair blare aware square despair unfair glare beware thoroughfare aftercare spyware coheir funfair prepare declare repair unaware forbear impair underwear earthenware bugbear ensnare horsehair midair forswear parterre repairer outerwear overbear tinware beachwear backstair ovenware setsquare everywhere anywhere compare silverware curare debonair disrepair solitaire medicare chinaware dinnerware foursquare maidenhair eldercare ironware legionnaire broodmare debonaire foreswear camelhair wirehair questionnaire doctrinaire tableware billionaire kitchenware millionaire concessionaire commissionaire millionnaire extraordinaire multimillionaire Words that almost rhyme with astheir
cell fell sell hell shell celle sel well tell del bell smell dwell gel spell swell tel dell delle nel yell befell belle weal bel knell nell telle jell outsell hotel dispel excel nouvelle quell gazelle pastel quel photocell resell undersell morel novelle oversell noel personnel farewell citadel expel repel foretell gaol motel propel unwell impel lapel decibel retell nacelle parallel compel infidel cartel carousel fontanelle bagatelle caravel misspell carrousel muscatel mademoiselle materiel organelle commonweal zinfandel clientele antipersonnel tagliatelle nonparallel therefor