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