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