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.
crape crap crappie grape crepe cripe croupe crepey crappy grapey creepie carp crop croppie crepy grope creep grapy croup carpi gripe creepy croupy grappa gripey grippe groupie gorp grip
crape drape serape sarape rape grape rap grapey hyperope drupe wrap crepe frap pyrope bewrap rope trope grapy tripe frappe trap gripe grope towrope cripe drapey crap ripe rewrap reap sharpie