Quick definitions from WordNet (black whale)
▸ noun: small dark-colored whale of the Atlantic coast of the United States; the largest male acts as pilot or leader for the school
▸ noun: large whale with a large cavity in the head containing spermaceti and oil; also a source of ambergris
▸ noun: small dark-colored whale of the Atlantic coast of the United States; the largest male acts as pilot or leader for the school
▸ noun: large whale with a large cavity in the head containing spermaceti and oil; also a source of ambergris