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