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.
cuspate cusped cuspid gasped
spate cuspate spat spade spaed spait spite zapateo respade respite despite dispute dissipate