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.
cratch crutch crotch caroach currach crash curch carritch creche grutch caroch crouch caroche carroch crush creesh grouch currish grouchy kerchoo
ratch cratch preachy parritch orache mariachi larch currach crotch caroach huaracho huarache earache broach breach birrotch arch brach wretch rotche rotch roach retch carritch reach crutch grutch march orach parch preach search