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.
summae summa sum same seme sima smew soma some sumo cymae samba sim som
gemmae summae mammae mae pommee comma mome meme mammey comae mamma lemma lamiae gumma gamma commie cammie femme mammie jimmie mime gimmie momma gimme pommie gemma summa mammee cymae tammie