largemouthed bass vs largemouth black bass

largemouthed bass and largemouth black bass both are nouns.

Word	Noun	Adjective	Verb	Adverb
largemouthed bass	Yes	No	No	No
largemouth black bass	Yes	No	No	No

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

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

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

largemouthed bass (noun)	largemouth black bass (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