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