Ballerina is one 9-letter word beginning with B and ending with A.
Biotechnological
bicarbonate
Bingo
balladeer, buccaneer, brigadier
Belated is a synonym for late. It begins with the letter b.
Some seven letter words starting with B are:bathtubdisturbperturbproverbrhubarbsuccumbtaxicabwashtub
bighug
Biology
bed
Beer
brought