Here's what rhymes with penniform.
form farm harm forme perform reform warm alarm charm inform storm norm swarm dorm uniform conform forearm disarm deform firearm nonfarm preform rearm vermiform overarm transform multiform outperform underarm rewarm chloroform cuneiform lukewarm thunderstorm schoolmarm yardarm misinform fusiform nonuniform cruciform Words that almost rhyme with penniform
horn psalm thorn shorn born corn borne torn worn barn warn scorn sworn yarn adorn morn mourn darn porn tarn lorn forlorn unborn forborne peppercorn unworn reborn outworn forewarn lovelorn timeworn lowborn firstborn stillborn unicorn waterborne careworn forsworn foresworn sweetcorn homme vom som com calm bomb palm mom bom balm nom rom tom dom mam suam pom iamb quam prom aplomb embalm qualm salaam consomme intercom pogrom firebomb becalm supermom cardamom