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.
perms prims proms prams permease primos promos primas proems praams primus premies hyperemias premiss paramos primsie premise preemies primes primacy
berms germs terms derms perms herms aurums formes seriemas dermas fermis proems bermes rams firms rums biremes quorums prams arums caroms crams rims roms charms warms proms rearms dreams dorms norms jorums larums kormas kermes grams cremes corms rems karmas gorms hareems creams arms harems marrams durums reams forums prims jorams zirams brims harms kermis serums trams carroms vermis barms vermes forms forams ferrums farms breams dermis dirams drams drums ihrams trims worms chirms
perm pram premie prim prima prime primi primo prom promo sperm