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