endocrine vs endocrine system

endocrine and endocrine system both are nouns.

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

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

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