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.
ratton rattoon rattan ratoon ratten ratteen radon ratan reattain ratany rotten ratine rhyton written redan redon rutin radian redone retain retene retine retune retinue routine
button mutton ratton cotton jetton ton cottony rattan mitten beton ratten gittin atony batten lattin fatten rattoon muton atone photon gotten tone muttony town ratoon bitten latten piton bouton chiton tony cyton ketone litten buttony phaeton phyton jeton baton betony futon kitten niton rotten sitten stony mattin toon newton patten puton mouton rhyton written seton stone duotone shotten
ratty rat drat prat grate grat crate irate frat bratty rutty brat rotte riata reata rato rate raita orate prate urate