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