beluga vs white sturgeon

beluga and white sturgeon both are nouns.

Word	Noun	Adjective	Verb	Adverb
beluga	Yes	No	No	No
white sturgeon	Yes	No	No	No

As nouns, beluga and white sturgeon are synonyms defined as:

beluga and white sturgeon: valuable source of caviar and isinglass; found in Black and Caspian seas

Other synonyms of beluga include Acipenser huso, hausen.

beluga (noun)	white sturgeon (noun)
valuable source of caviar and isinglass; found in Black and Caspian seas	food and game fish of marine and fresh waters of northwestern coast of North America
small northern whale that is white when adult	valuable source of caviar and isinglass; found in Black and Caspian seas