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