parenteral vs physiology

parenteral is not a noun while physiology is a noun.

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

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

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