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.
parsley parasol prosily pursily parasail porously prissily parcel presale presell pricily perusal
parsley hirsle hoarsely horsily coarsely grisly pursily tersely warsle
pars pairs paras pares paris parrs parse pears spars sparse