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.
senega seneca sanga sneak seeing sneaky snug snog snag sing sang song sung snack snaky sneck suing scenic snaggy
senega fanega neg tanga anga fanga conga linga lingua manga nonego panga sanga seneca sneak donga nongay tonga
sene sen esne syne sone sinewy sinew sine sewn sienna senna seine seen scene scena sane usnea