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.
cowshed coshed cashed coached couched cached gashed gushed quashed couchette cachet cushat
cowshed shed bushed bashed ashed shoed shied quashed fashed leashed gnashed moshed pashed pushed rushed dashed dished washed whooshed wooshed mashed hashed fished meshed joshed cashed coshed gashed gushed lashed hushed lushed mushed noshed pished reshoed sashed deashed tushed whished wished shushed