sympathetic vs sympathetic nervous system

sympathetic is not a noun while sympathetic nervous system is a noun.

Word	Noun	Adjective	Verb	Adverb
sympathetic	No	Yes	No	No
sympathetic nervous system	Yes	No	No	No

sympathetic (noun)	sympathetic nervous system (noun)
	originates in the thoracic regions of the spinal cord; opposes physiological effects of the parasympathetic: reduces digestive secretions; speeds the heart; contracts blood vessels

sympathetic (adjective)	sympathetic nervous system (adjective)
expressing or feeling or resulting from sympathy or compassion or friendly fellow feelings; disposed toward
(of characters in literature or drama) evoking empathic or sympathetic feelings
of or relating to the sympathetic nervous system
relating to vibrations that occur as a result of vibrations in a nearby body
showing or motivated by sympathy and understanding and generosity
having similar disposition and tastes