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