Delphinapterus leucas vs white whale

Delphinapterus leucas and white whale both are nouns.

Word	Noun	Adjective	Verb	Adverb
Delphinapterus leucas	Yes	No	No	No
white whale	Yes	No	No	No

As nouns, Delphinapterus leucas and white whale are synonyms defined as:

Delphinapterus leucas and white whale: small northern whale that is white when adult

Other synonyms of Delphinapterus leucas include beluga.

Delphinapterus leucas (noun)	white whale (noun)
small northern whale that is white when adult	small northern whale that is white when adult