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.
mammeys mameys mammees mammies mamies mammas mummies mamboes mommies momes mumms maims mimes mamas mambas mambos mimeos mems moms mums memes memos momus mumus mommas muumuus
mammeys emmys shimmies shammes whammies tommies dummies pommies mommies mimes femmes homeys immies gimmes gimmies jammies jemmies jimmies cammies commies limeys mameys mammees mammies momes mummies rummies tammies tummies chammies shammies yummies
mammee mammey mamey mamie mamma mammae mammie mammy