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