Here's what rhymes with decasyllabon.
don dawn bon pawn bonne john upon non drawn gone von con lawn yon hon wan fawn han schon spawn yawn yuan khan sawn sonne vpon brawn prawn faun gnawn thereon thereupon baton foregone swan exon npon operon redrawn begone chiffon forgone hereupon pecan tenon aileron predawn lasagne withdrawn whereupon salon whereon fagon chaperon hereon mastodon autobahn heptagon outdrawn undergone polygon denouement pantheon echelon marathon octagon paragon overdrawn amazon antiphon epsilon tarragon woebegone carillon leprechaun cordovan neocon trimaran upsilon frogspawn methadon lexicon automaton positron rapprochement hexagon pentagon emoticon phenomenon pantechnicon Words that almost rhyme with decasyllabon
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 embalm iamb along strong belong quam throng ftrong suam aplomb singsong 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 timeworn unworn foresworn sweetcorn unicorn waterborne lovelorn peppercorn