smallmouth bass vs smallmouth black bass

smallmouth bass and smallmouth black bass both are nouns.

Word	Noun	Adjective	Verb	Adverb
smallmouth bass	Yes	No	No	No
smallmouth black bass	Yes	No	No	No

As nouns, smallmouth bass and smallmouth black bass are synonyms defined as:

smallmouth bass and smallmouth black bass: a variety of black bass; the angle of the jaw falls below the eye

Other synonyms of smallmouth bass include Micropterus dolomieu, smallmouth, smallmouthed bass, smallmouthed black bass.

smallmouth bass (noun)	smallmouth black bass (noun)
a variety of black bass; the angle of the jaw falls below the eye	a variety of black bass; the angle of the jaw falls below the eye
flesh of smallmouth bass