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.
creche caroche curch crotch crouch crutch creesh cratch caroch caroach currach carroch carritch crash crush grouch grutch currish grouchy kerchoo
creche barouche troche dreich preach orache ruche huarache farouche earache broche brioche breech breach wretch rechew reach rouche rotche retch reechy reecho fourchee caroche merch perch soroche trachea trochee
care core crew cure acre ocrea ocreae recarry recur wrecker scree screw screwy checker checkrow