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.
piston postin pastina posteen postteen
boston neuston piston teston seton testoon moisten stun postin fuzztone astony festoon stone stony acetone misatone hasten histone isotone keystone listen cyton fasten chasten
pistou piste pst pasty pesto psst past pasta paste pastie postie peised pest pesty piosity pissed poised post episode