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.
croupous croups croupes crops groups corpus carpus groupies croppies carps corps craps corpse crapes cripes crepes creeps gropes crappies creepies gorps grips grapes gripes kreeps
croup croupe croupy crop croppie group groupie