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.
currach curch cratch caroach carroch currish carritch crash caroch crouch creche crutch crotch caroche crush gursh qursh creesh grouch grutch qurush grouchy kerchoo
currach ratch reach roach brach breach broach earache huarache huaracho caroach carroch cratch orach orache preach
curr curia curiae currie curry scurry cur