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.
whereas wheres wherries whores whirs wires weirs wears wares whirrs wooers wearies wars whirries wairs warsaw worries
whereas eras cereus faeries creasy haeres greasy nereis boreas peeries seres peeress seeress sierras rears derays feres terras ferias urease wheres ceres heresy veeries areas cerias eyres crease erase grease meres aeries eyras peres serais bureaus heres gerahs zeroes heroes terais queries ureas quaeres series choreas ras res ers