There are far too many to list in actual fact there are precisely 27664 words beginning with the letter B in the English dictionary.
A few to get you started:
Thousands of words begin with the letter B. Listing all of them would be rather time consuming and fairly inefficient in terms of resources used. Here are a few simple examples.
Boat
Bug
Bind
Bind
Bad
badger
Bellow
Beguile
Bargain
Balance
Because
Between
Borrow
Belong
Brandish
Bellicose
Belligerent
A 4 letter word that begins with B is bend.
bend..........
Boost is a synonym for the word lift and starts with the letter B.
baobab.
Blurb
butter
Birthday.
Bet
bunting
bathtub, brewpub
The word bat starts with the latter b and it ends with the latter a and t
The five letter word for a brief advertisement is blurb.