largemouth black bass vs Micropterus salmoides

largemouth black bass and Micropterus salmoides both are nouns.

Word	Noun	Adjective	Verb	Adverb
largemouth black bass	Yes	No	No	No
Micropterus salmoides	Yes	No	No	No

As nouns, largemouth black bass and Micropterus salmoides are synonyms defined as:

largemouth black bass and Micropterus salmoides: a large black bass; the angle of the jaw falls behind the eye

Other synonyms of largemouth black bass include largemouth, largemouth bass, largemouthed bass, largemouthed black bass.

largemouth black bass (noun)	Micropterus salmoides (noun)
a large black bass; the angle of the jaw falls behind the eye	a large black bass; the angle of the jaw falls behind the eye