Hexanchus griseus vs cow shark

Hexanchus griseus and cow shark both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hexanchus griseus	Yes	No	No	No
cow shark	Yes	No	No	No

As nouns, Hexanchus griseus and cow shark are synonyms defined as:

Hexanchus griseus and cow shark: large primitive shark widely distributed in warm seas

Other synonyms of Hexanchus griseus include six-gilled shark.

Hexanchus griseus (noun)	cow shark (noun)
large primitive shark widely distributed in warm seas	large primitive shark widely distributed in warm seas