| pilot whale | (n) small dark-colored whale of the Atlantic coast of the United States; the largest male acts as pilot or leader for the school, Syn. black whale, Globicephala melaena, blackfish, common blackfish |
| sperm whale | (n) large whale with a large cavity in the head containing spermaceti and oil; also a source of ambergris, Syn. cachalot, black whale, Physeter catodon |