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.
beret beretta buret berretta barret berate brit brat berried bort brut bred biretta burette birretta barrette borty bread britt brede bruit bored beard boart bared breed burred bright bready bratty birred baryta barred burrito bard bird brad burd
beret ret ferret buret barret arete rete caret ferrety curet great peart merde pert sered derat terret treat turret whereat cheered cherty queered veered fret leered vertu heart hereat hereto jeered cruet vert garret greet merit peered cered surety terete tiered tret wert whereto chert sheered
bare bear beer beery berry bewray bier bore bree brew bureau byre bebeeru