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.
tern terne turn torn tarn terrine terreen terrane terrain terrene trona treen train tranny triene tureen turion deraign tourney tyranny darn durn triennia drain drawn drown trine trone
ern fern wyvern hern kern quern tern