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.
monitor monitory mentor mounter montero minatory monetary miniature mantra minter mintier minuter minaudiere mender minder maunder meander
genitor janitor monitor uniter dinitro niter nitre nitro vanitory cantor contour mentor reuniter santoor santour senator monitory donator punitory chantor
manito manitou manitu monied monte mount