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chaperon chiffon forgone overdrawn aileron amazon antiphon hereon predawn neocon trimaran frogspawn outdrawn methadon withdrawn thereupon whereupon polygon denouement pantheon positron echelon marathon paragon hereupon pentagon epsilon mastodon tarragon woebegone leprechaun cordovan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