smallmouth bass vs smallmouthed black bass

smallmouth bass and smallmouthed black bass both are nouns.

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

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

smallmouth bass and smallmouthed 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, smallmouth black bass, smallmouthed bass.

smallmouth bass (noun)	smallmouthed 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