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.
terrain terrine terrane train tern terrene trainee terreen deraign drain terne trine tranny turion taurine tyranny tarn torn turn drawn treen trona durian durion triene tureen dourine
murrain terrain rain terrine carrion murrine morrion moraine marrano grainy grain curran brainy serrano brain arraign rainy reran sierran drain deraign terrane train ran rin
terra terrae terai terry tetra