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.
muumuus mumus mums mumms mummies mems moms momus mamas momes memos memes mimes maims mameys mamies mambas mimeos mammas mambos mommas mimosa mamboes mammees mammeys mammies mommies
muumuus hummus humus mumus mus