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.
pily ply poly pial play paly ploy pili pail pill pile pillowy poilu pilea pilau pally pilei pilaw pulley pillow pal pol pul pula plew pull polo pule plie pool poll pele peel puli plow pale peal pawl pall pole plea palea polio
gaily lily noily oily pily roily daily doily wily shily