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