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