smallmouthed bass vs smallmouth bass

smallmouthed bass and smallmouth bass both are nouns.

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

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

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

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

smallmouthed bass (noun)	smallmouth 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