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.
boors broos boars boras bores boreas bourse borrows bros bars burs bras bris bourrees buhrs biers bries brosy birse braws brows byres bares braes brees brose bears biros brays brass briss beers buras bursa birrs burse burrs brews brios borzoi braise bruise bursae buries burros browse barres brassy burghs brughs hybris barrios barrows berries bewrays brassie bureaus burrows
boors moors doors ors karroos fours roars hoers ours gores boras cores coirs horse hours soras pores horas gorsy worse whores hoars noris yores giaours shoers chores mores morse ores toras horsy corse zoris dors toros tors torsi torus torso loris goers lores noirs sorus mors gorse broos roose tours cors cooers fores lours moras oars boars koras wooers bores karoos torse torrs tores dorrs kors doers dorsa soars sores pours pooris choirs chorus sours shores yours
boor boar bora bore borrow bourree broo