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.
cushat couchette cachet cashed coshed gushed couched cowshed quashed
shat cushat whisht reshot recheat outcheat mishit leachate shut bowshot shot shoat shit shad cheat chat chitchat
cushaw cushy cash cashaw cashew cashoo cosh cuish gush gushy