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