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