Bee, butterfly, beautiful, beauty, big, belly, bug, boring, brick, brass, bass, bad etc
bicarbonate
Bingo
ballistic
Biotechnological
bibliography
Belated is a synonym for late. It begins with the letter b.
Some seven letter words starting with B are:bathtubdisturbperturbproverbrhubarbsuccumbtaxicabwashtub
bighug
Beer
bed
Biology
Brit