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.
beers brees biers bears bris bars burs bras bewrays berries bros bourrees brios buhrs braes brays boras brows byres briss birrs bores brews boars broos bursa bries braws bares biros buras brass burse boors birse burrs brosy brassy brughs bursae breezy burghs burros breeze buries boreas bourse barres hybris barrios barrows borrows bureaus burrows
beers cheers sheers queers deers jeers veers leers seers peers ers quaeres purees sers rears soirees hers prees ceres rees seres sirees brees verse lehrs bourrees sieurs ruers viers suers sarees shoers bears haeres wooers weirs trees terse drees cooers sirrees keirs ceros frees gears goers piers grees queuers nears eros lears xerus peres hoers cheeros creese sears feres hypers kiers zeros hears heres perse eras ears biers larees hirees meres verso peris pears liers heirs heros fears errs doers dears tears tiers wears wheres shears shiers years
beer beery bear berry bewray bier bree bebeeru