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.
mums mumms mumus moms mems muumuus mummies maims momes memos memes mimes momus mamas mameys mamies mambas mambos mammas mommas mimeos mimosa mamboes mammees mammeys mammies mommies
bums hums geums gaums gums lums mums neums rums sums doums chums