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.
crutch grutch crouch crotch cratch curch crush carritch caroch grouch creche carroch caroach grouchy currach caroche crash creesh qurush currish grushie kerchoo
crutch grutch parritch birrotch rotch rotche rouche ruche ratch wretch retch carritch barouche cratch crotch crouch curch grouchy farouche grouch lurch church