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