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