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.
triennia triene treen trona train trine tranny turion triune tureen terrene taurine terrine terrain terreen trainee tyranny tarn tern torn turn drain terne trone durian durion