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.
navvy navy nave knave naevi naive naff naif neve nevi nova
navvy savvy heavy cavy leavy navy peavey peavy civvy savoy davy divvy wavey wavy chivvy