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