northern pike vs Esox lucius

northern pike and Esox lucius both are nouns.

Word	Noun	Adjective	Verb	Adverb
northern pike	Yes	No	No	No
Esox lucius	Yes	No	No	No

As nouns, northern pike and Esox lucius are synonyms defined as:

northern pike and Esox lucius: voracious piscivorous pike of waters of Northern Hemisphere

northern pike (noun)	Esox lucius (noun)
voracious piscivorous pike of waters of Northern Hemisphere	voracious piscivorous pike of waters of Northern Hemisphere