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.
drek dreck drecky dreg trek dark dork dirk drake drouk darky dorky drogue darkie dreggy darkey druggie derrick drag drug turk trike troke trock troak tarok trick traik track duroc daric truck