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.
toon ton toonie town tony tone toney tonne towny tauon townie townee tin tun don tan ten tonneau tuna tiny done tain tune dona teen down tine tyne donne tawny teeny tenia tinea tinny donee donna downy tunny
boon coon goon loon moon noon poon soon zoon toon shoon on