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