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.
salal salol sallowly slily slyly slowly solely sillily
salal halal lall leally fallal filially flail halala halalah hallal molal salol shillala shillalah
sal sail sale sall sallow sallowy sally saul seal selah slaw slay sola