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.
manteau manta manitu mantua manitou manatee mannite manat monte menta maned meant moaned maenad mentee manned minute manito mint mined minty monde maund mount hymned maundy menudo minuet monied mooned