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.
treen tureen terreen triene tern terrene turn tarn torn trainee triennia train trona trine terne trone tranny turion triune taurine terrain terrane terrine tourney tyranny darn durn
boreen careen treen preen moreen green terreen tureen rein pereon greeny siren warren hereon serein terrene whereon barren arene herein bren murein wherein frena serene pyrene arena wren gyrene syren chirren
tree dree tare tire tore trey true tyre redear reedier retear steer strew teeter