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echelon octagon chaperon pentagon tenon aileron epsilon woebegone heptagon lasagne neocon pantechnicon undergone withdrawn thereupon paragon redrawn hereupon overdrawn amazon predawn tarragon autobahn carillon leprechaun upsilon frogspawn outdrawn methadon whereupon denouement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