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.
momma mamma mommy mom mammae mumm momi mome mummy mammy mammey mammee mammie mem mim mum maim mama meme memo mime mumu
comma momma douma summa pommy gemma gemmae caeoma coma comae commy gumma gamma lemma louma mamma mammae mommy noma soma summae tommy
mommy momma mom pommy pommee comma commie commy mamma mammae mammee mammey mome momi mumm mummy mammie pommie mammy tommy