Here's what rhymes with pentagon.
gone con khan begone don non von dawn lawn yon hon wan bon fawn han pawn schon yawn bonne exon sawn sonne vpon pecan faun john gnawn upon drawn undergone thereon polygon baton spawn swan yuan fagon brawn chiffon prawn tenon woebegone heptagon neocon lexicon salon foregone whereon octagon paragon forgone aileron antiphon hereon predawn tarragon autobahn lasagne emoticon outdrawn withdrawn denouement pantheon echelon hexagon marathon redrawn chaperon amazon epsilon mastodon carillon trimaran upsilon pantechnicon methadon thereupon whereupon automaton positron hereupon overdrawn leprechaun cordovan frogspawn phenomenon rapprochement Words that almost rhyme with pentagon
com calm gong becalm long wrong belong song bomb palm mom quam bom homme vom balm nom rom som tom dong intercom mam thong pom pong tong bong qualm iamb along throng prom prong pogrom twang embalm sarong erelong dingdong strong prolong aplomb singsong salaam yearlong consomme mahjong nightlong lifelong firebomb supermom cardamom livelong corn born borne torn worn barn horn warn scorn yarn morn mourn thorn shorn darn porn tarn lorn sworn adorn peppercorn forlorn unborn reborn outworn stillborn unicorn careworn forborne timeworn unworn lowborn waterborne forewarn sweetcorn firstborn forsworn lovelorn foresworn