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.
testoon teston destain destine destiny dystonia distain
festoon testoon seton stone stony astony boston histone keystone neuston piston teston
test testa testae testee testy