Antimatter rhymes with:
matter, smatter, attar, batter, blatter, chatter, chitterchatter, clatter, fatter, flatter, hatter, latter, matter, mcfatter, mcphatter, natter, patter, platter, sater, satter, scatter, schlatter, shatter, slatter, smatter, spatter, splatter, tatar, tatter, vanatter, vannater, vannatter, vatter