ballast
malaria
How about "density"?
Seven.
custody calumny
Some seven letter words starting with B are:bathtubdisturbperturbproverbrhubarbsuccumbtaxicabwashtub
malaria
alpacas
episode.
"INKHORN"
How about "density"?
Anatomy, archery
bravery
ballast
nervous
Teacher
Seven.
willows