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.
netop neotype
netop top stoup stope stop stoop setup metope getup letup biotope atopy atop topo topi tope stowp
net neat nett netty newt into neonate neoned onto unto