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