I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
tromp trompe tramp trump trampy
romp tromp ramp rump frump cramp crimp crump gramp grump primp tramp trompe trump warmup shrimp
term tram trim trumeau tryma stroma