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echelon hexagon redrawn chaperon overdrawn pentagon amazon epsilon mastodon carillon heptagon trimaran upsilon emoticon withdrawn thereupon whereupon automaton positron rapprochement marathon hereupon leprechaun frogspawn methadon pantechnicon phenomenon Words that almost rhyme with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