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.
greatly greedily grittily gradually credal curtly gradual crudely creedal courtly cordially cartel curtal kirtle cordial curtail griddle
greatly rattly aureately irately lyrately partly peartly pertly seriately tartly
great grat create grate greet groat egret