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.
ratan rattan ratany reattain ratton retain ratten radian ratine ratoon ratteen rattoon radon redan rutin retene retine retune rhyton rotten retinue routine written
ratan tan eaten tain butane botany beaten baton attain retain rattan satin soutane stane detain tetany wheaten shaitan gitano laten phytane ratany matin neaten oaten patin cotan paten litany reattain cetane seitan stain zeatin dittany titan witan sheitan
rat raita drat prat rate rato ratty reata riata rota brat bratty frat irate crate grat grate orate prate urate