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.
grippe gripe grippy gripey grip grape grope cripe gripy grapey grappa croppie groupie crappie gorp crape crepe grapy group crappy crepey croupe creepie
grippe rappee ripe frappe crappie cripe croppie gripe gripey grippy liriope preppie drippy tripe trippy