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.
slyly slily slowly salal salol xylyl solely sillily sallowly
slyly allyl xylyl toluyl tolyl
sly sall sallow sallowy sally sell selle sill silly slay sully syli asyla psylla