red rockfish vs red rockfish

red rockfish and red rockfish both are nouns.

Word	Noun	Adjective	Verb	Adverb
red rockfish	Yes	No	No	No
red rockfish	Yes	No	No	No

red rockfish (noun)	red rockfish (noun)
a large fish of the Pacific coast of North America	a large fish of the Pacific coast of North America
red flesh of large food fish of Pacific coast	red flesh of large food fish of Pacific coast