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