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gnawn whereupon baton foregone swan operon redrawn begone chiffon forgone hereupon pecan tenon aileron predawn lasagne withdrawn thereon salon whereon echelon exon fagon marathon paragon chaperon hereon autobahn carillon leprechaun outdrawn methadon undergone polygon denouement pantheon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