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.
weepy weep wheep weepie whippy wap whoopee wop whap whip whop whup wipe
seepy weepy cheep weep tepoy deep sepoy seep repay peppy peep neep keep jeep heapy veep beep wheep sheep