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.
tophus tophs typhus tophes typhous tofus taphouse toughs typhose toughies doghouse tuffs toffs tufas doofus devious diphase toffees toffies
scyphus tophus typhus tophs tophes syphs sophs raphis raphes ouphes phis qophs kophs kaphs caphs ephas aphis typhous ouphs