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octagon paragon redrawn chaperon chiffon hereupon overdrawn aileron mastodon predawn neocon upsilon outdrawn phenomenon withdrawn foregone forgone pentagon epsilon woebegone carillon trimaran emoticon frogspawn hexagon leprechaun heptagon cordovan lexicon rapprochement pantechnicon Words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