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