white sturgeon vs sturgeon

white sturgeon and sturgeon both are nouns.

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

As nouns, sturgeon is a hypernym of white sturgeon; that is, sturgeon is a word with a broader meaning than white sturgeon:

white sturgeon: food and game fish of marine and fresh waters of northwestern coast of North America
sturgeon: large primitive fishes valued for their flesh and roe; widely distributed in the North Temperate Zone

As nouns, sturgeon is a hypernym of white sturgeon; that is, sturgeon is a word with a broader meaning than white sturgeon:

white sturgeon: valuable source of caviar and isinglass; found in Black and Caspian seas
sturgeon: large primitive fishes valued for their flesh and roe; widely distributed in the North Temperate Zone

white sturgeon (noun)	sturgeon (noun)
food and game fish of marine and fresh waters of northwestern coast of North America	large primitive fishes valued for their flesh and roe; widely distributed in the North Temperate Zone
valuable source of caviar and isinglass; found in Black and Caspian seas