smallmouthed black bass vs smallmouth black bass

smallmouthed black bass and smallmouth black bass both are nouns.

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

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

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

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

smallmouthed black 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