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.
rattan ratan reattain ratany ratten ratton ratteen rattoon rotten retain radian ratoon ratine written radon redan rutin retene retine retune rhyton retinue routine
rattan tan bitten batten attain kitten lattin litten botany mitten patten butane ratany ratten reattain rotten cetane sitten stain detain tetany witan sheitan ratan tain mutton button phytane gitano gittin jetton cotan cotton fatten gotten latten mattin litany ratton retain written seitan soutane stane dittany titan shaitan shotten
ratty rat drat prat grate grat crate irate frat bratty rutty brat rotte riata reata rato rate raita orate prate urate