Delphinapterus leucas vs beluga

Delphinapterus leucas and beluga both are nouns.

Word	Noun	Adjective	Verb	Adverb
Delphinapterus leucas	Yes	No	No	No
beluga	Yes	No	No	No

As nouns, Delphinapterus leucas and beluga are synonyms defined as:

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

Other synonyms of Delphinapterus leucas include white whale.

Delphinapterus leucas (noun)	beluga (noun)
small northern whale that is white when adult	valuable source of caviar and isinglass; found in Black and Caspian seas
	small northern whale that is white when adult