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