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.
plow pillow polo ploy plew pillowy polio pilaw pul ply pol pal pale puli plie peel pool pele plea pula play peal paly pail pawl pial poll pili pall pule pole pily pill poly pile pull palea pally pilau pilea pilei poilu
low allow shallow wallow slow plow mellow glow callow hollow hallow follow flow fellow fallow blow billow below bellow alow mallow pillow sallow tallow willow yellow lo