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