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.
manana mannan minion munnion
nana banana jnana manana zanana zenana nan gnawn naan banian aeonian eonian honan inane mannan
mana man myna main mane mania manna mano many mawn maun mean meanie meany mina minae moan mynah