sperm whale vs black whale

sperm whale and black whale both are nouns.

Word	Noun	Adjective	Verb	Adverb
sperm whale	Yes	No	No	No
black whale	Yes	No	No	No

As nouns, sperm whale and black whale are synonyms defined as:

sperm whale and black whale: large whale with a large cavity in the head containing spermaceti and oil; also a source of ambergris

Other synonyms of sperm whale include cachalot, Physeter catodon.

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