limbic system vs limbic brain

limbic system and limbic brain both are nouns.

Word	Noun	Adjective	Verb	Adverb
limbic system	Yes	No	No	No
limbic brain	Yes	No	No	No

As nouns, limbic system and limbic brain are synonyms defined as:

limbic system and limbic brain: a system of functionally related neural structures in the brain that are involved in emotional behavior

Other synonyms of limbic system include visceral brain.

limbic system (noun)	limbic brain (noun)
a system of functionally related neural structures in the brain that are involved in emotional behavior	a system of functionally related neural structures in the brain that are involved in emotional behavior