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.
doofus tofus dufus doffs doghouse defuse devious dieoffs diffuse difs toffs diffs doves defis daffs duffs defies defuze tophus toughs deifies toffees toffies typhous taphouse toughies
doofus tofus baghouse roughhouse refuse oafs poofs fuss loofs feoffs sofas boffs effuse howfs doffs taphouse dieoffs fuse feus uveous woofs bughouse loofas rufous suffuse defuse hoofs roofs poufs niveous offs loafs toffs goofs coofs coifs coffs doghouse diffuse dufus devious typhous whoofs chophouse