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.
boreen bren born boron bourn borne barren borane bourne bran burn brin barn buran bruin bairn brain brawn burin baron brown briny barny brine burnie browny briony branny brawny brainy barony barney byrnie baronne biriani brownie
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
bore bare boar boor bora borrow bourree brae bree brew brie bureau byre