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.
mammatus mammets mammitis maumets
mammatus mats teammates roommates numbats mates matts mauds mauts meats meatus vomitus moats hamates humates gemmates comates combats gummatous remates summates wombats
mammate mammati mammet imamate