endocrine system vs endocrine

endocrine system and endocrine both are nouns.

Word	Noun	Adjective	Verb	Adverb
endocrine system	Yes	No	No	No
endocrine	Yes	Yes	No	No

endocrine system (noun)	endocrine (noun)
the system of glands that produce endocrine secretions that help to control bodily metabolic activity	the secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect
	any of the glands of the endocrine system that secrete hormones directly into the bloodstream

endocrine system (adjective)	endocrine (adjective)
	of or belonging to endocrine glands or their secretions