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.
gradate graduate grated graded cordate grided crated cordite greeted curated gritted guarded curtate crawdad grouted gridded garoted created garroted corraded gratuity garotted corotate garreted crawdaddy garrotted corded credit carted carded curded courted crowded crudded crudity gordita quartet quirted
gradate radiate redate airdate eradiate foredate irradiate cordate graduate periodate predate reradiate chordate