largemouth bass vs largemouthed black bass

largemouth bass and largemouthed black bass both are nouns.

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

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

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

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

largemouth bass (noun)	largemouthed 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
flesh of largemouth bass