Here's what rhymes with onfly.
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 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 hereby underlie samurai belie overlie lanai barfly reply deny whereby comply nuclei alkali defy verify butterfly alibi amplify nullify decry pupae termini untie amoebae descry mollify ramify vilify aquae bonsai firefly ossify retry amebae blowfly horrify misapply turfy overfly scurfy mummify shanghai ripply banzais overbuy occupy satisfy modify certify goodbye notify alveoli fortify magnify pacify ratify standby unify falsify lullaby terrify edify mortify resupply deify dragonfly mystify triply ultrahigh vivify calcify stupefy scarify versify vitrify drachmai dandify yuppify justify stimuli clarify multiply qualify specify classify signify simplify testify glorify gratify purify quantify rectify beautify solidify typify codify crucify dignify liquefy oversupply personify acidify stratify stultify emulsify petrify reunify cumuli liquify hyperbolae prettify beatify gentrify refortify speechify syllabify identify intensify diversify demystify detoxify revivify dissatisfy solemnify exemplify disqualify indemnify electrify preoccupy reclassify declassify objectify oversimplify misidentify transmogrify