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