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.
gripe grippe gripey grip grape grope cripe gripy grippy grapey groupie gorp grapy group crepe crape grappa crepey croupe crappie creepie croppie carp crap crop
ripe cripe gripe tripe rip grip trope hyperope trip euripi drupe crape drape crepe sarape gripey rope grape pyrope grippe serape gripy drip grope towrope rape liriope sharpie