biotic
Belated is a synonym for late. It begins with the letter b.
A synonym for "many" that starts with the letter "b" is "numerous." However, if you're looking for a word that directly starts with "b," you could consider "bountiful" as it conveys a sense of abundance.
Boost is a synonym for the word lift and starts with the letter B.
A synonym for mistake starting with B is blunder (or boo boo).
Brighter.
start or starts
Bravery.
This could be the word "barber" or "beautician."
brush
Trade.
a strange painting =B
meek