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.
gummata commata gummite gammadia gummed gumboot gamut comate combat commit gammed gaumed gomuti gambit gamete commute gambade gambado
commata gummata lemmata bemata hammada gemmate mammate mammati roommate somata summate teammate mat