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There are a lot of 5 letter word in English that start with "B". Wordle uses only the most common ones. Here is the complete list.

bacon, badge, badly, bagel, baggy, baker, baler, balmy, banal, banjo, barge, baron, basal, basic, basil, basin, basis, baste, batch, bathe, baton, batty, bawdy, bayou, beach, beady, beard, beast, beech, beefy, befit, began, begat, beget, begin, begun, being, belch, belie, belle, belly, below, bench, beret, berry, berth, beset, betel, bevel, bezel, bible, bicep, biddy, bigot, bilge, billy, binge, bingo, biome, birch, birth, bison, bitty, black, blade, blame, bland, blank, blare, blast, blaze, bleak, bleat, bleed, bleep, blend, bless, blimp, blind, blink, bliss, blitz, bloat, block, bloke, blond, blood, bloom, blown, bluer, bluff, blunt, blurb, blurt, blush, board, boast, bobby, boney, bongo, bonus, booby, boost, booth, booty, booze, boozy, borax, borne, bosom, bossy, botch, bough, boule, bound, bowel, boxer, brace, braid, brain, brake, brand, brash, brass, brave, bravo, brawl, brawn, bread, break, breed, briar, bribe, brick, bride, brief, brine, bring, brink, briny, brisk, broad, broil, broke, brood, brook, broom, broth, brown, brunt, brush, brute, buddy, budge, buggy, bugle, build, built, bulge, bulky, bully, bunch, bunny, burly, burnt, burst, bused, bushy, butch, butte, buxom, buyer, bylaw,