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.
mom mome momi mommy momma mum mim mem mime meme mumu mumm maim memo mama mummy mamma mamey mammy mambo mamba mamie mimeo mammae mammee mammey mammie muumuu
mom mome momi momma mommy mm mo om