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.
ratoons rattoons rattons radons ratans rattens rhytons rattans ratines ratteens ratanies rootiness reattains redons rutins redans radians retains retines retunes retenes retinues routines readiness rowdiness ruttiness rottenness reddens redness retinas
toons ratoons rattoons tons duotones setons jettons rhytons buttons phytons rattons pitons phaetons putons nitons muttons moutons cottons jetons photons codons newtons betons batons atones towns tonus tones futons ketones boutons mutons cytons stones chitons