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.
gripey gripy gripe grapey grippe grippy grip cripe grope grapy grape crepey groupie gorp crape crepy group crepe crappy creepy croupe croupy grappa crappie creepie croppie
gripey ripe ropey crepey cripe grapey gripe grippe grippy gripy liriope drapey drippy tripe trippy chirpy