physiology vs parenteral

physiology is a noun but parenteral is not a noun.

Word	Noun	Adjective	Verb	Adverb
physiology	Yes	No	No	No
parenteral	No	Yes	No	No

physiology (noun)	parenteral (noun)
processes and functions of an organism
the branch of the biological sciences dealing with the functioning of organisms

physiology (adjective)	parenteral (adjective)
	located outside the alimentary tract
	administered by means other than through the alimentary tract (as by intramuscular or intravenous injection)