Here's what rhymes with modafinil.
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near mere mir year dear fear beer rear deer gear peer shear sheer cheer pier smear sneer veneer feare leer veer vere vir yeare amir emir jeer sear sere vizir appear clear severe career sphere sincere queer spear steer persevere inhere servir blear besmear thornier rainier hornier leafier downier disappear frontier pioneer adhere premier unclear austere premiere reappear cashier revere souvenir auctioneer cohere tapir domineer gazetteer compeer balladeer bathysphere brainier grainier lavalier bawdier cornier cushier runtier atmosphere engineer interfere hemisphere volunteer cavalier financier insincere biosphere chandelier charioteer chevalier privateer profiteer mutineer triumvir chanticleer killdeer cafetiere junketeer brigadier lithosphere mountaineer acyclovir pamphleteer yesteryear bombardier commandeer gondolier muleteer bandolier mesosphere racketeer exosphere marketeer bandoleer electioneer scrutineer fusileer stratosphere troposphere hydrosphere conventioneer