Here's what rhymes with grainsupply.
apply dry lie supply try ly ply rye lye pry tri trie wry lai luy pri by my high why die thy y buy cry fly guy tie vi hi shy sigh bi bye chi dye fi hy nigh pi pie thai thigh vie dei fry psi quae sly ty wir awry hai mai muy nai belie cy fy kai mei sy tai thei wai phi spry misapply slier reply sky deny imply rely comply defy spy underlie decry pupae untie overlie resupply sty aquae firefly retry amebae stye turfy lanai overfly ripply thereby nearby whereby hereby multiply butterfly certify goodbye alibi samurai terrify amoebae descry edify oversupply bonsai deify ossify triply ultrahigh blowfly stupefy scurfy versify barfly shanghai vitrify drachmai banzais overbuy yuppify justify occupy satisfy modify nuclei alkali classify simplify verify notify purify alveoli amplify fortify nullify pacify ratify standby unify beautify lullaby solidify termini typify codify crucify mollify mortify ramify vilify acidify mystify stultify vivify horrify petrify cumuli scarify hyperbolae mummify prettify speechify syllabify stimuli clarify qualify specify signify testify glorify gratify magnify rectify falsify dignify liquefy stratify calcify emulsify reunify liquify beatify gentrify refortify dandify identify exemplify intensify quantify diversify objectify oversimplify personify demystify dragonfly electrify preoccupy revivify dissatisfy declassify solemnify disqualify indemnify detoxify reclassify misidentify transmogrify