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.
quadrate quadrat cutthroat
hydrate quadrate rehydrate dehydrate drat literate deuterate derate striate butyrate saturate federate reiterate deaerate patriate moderate derat iterate maturate citrate quadrat stearate outrate nitrate titrate