"BE HOME BY 6:00!" Lol!
bellow
bra
I just ran into having the same question. The only thing I can think of starting with the letter B is blouse.
People shout be right back, bingo, boo, bravo and bye. They begin with the letter b.
You should wear bowling shoes at the bowling alley. They begin with the letter B.
Beret, or blouse, bandannas or bags I guess could work too.
beanie
No States starting with the letter 'B' in the United States. Alabama and Nebraska both contain the letter 'b'.
Blue
beer
Beer
barye