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positron marathon redrawn chaperon hereupon overdrawn pentagon mastodon heptagon cordovan trimaran methadon phenomenon withdrawn leprechaun frogspawn rapprochement pantechnicon Words that almost rhyme with semioctagon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