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.
mumus mums muumuus momus mumms mems mummies moms memos memes mamas mimes maims momes mimosa mamies mambas mommas mammas mambos mimeos mameys mamboes mammees mammeys mammies mommies
humus mumus mus wamus sums doums rimous cymous pneumas ramous neumes nimbus geums hums emeus dumbs chymous kumys koumis gums gaums hummus lums heaumes fumes famous emus bums loumas amuse bemuse mums lumas kombus amus limbus koumys muss muse iambus comous gummous mumms momus awmous muumuus neums numbs pumas ramus rums sumos doumas dumas wammus chums shamus