physiology vs biology

physiology and biology both are nouns.

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

As nouns, biology is a hypernym of physiology; that is, biology is a word with a broader meaning than physiology:

physiology: the branch of the biological sciences dealing with the functioning of organisms
biology: the science that studies living organisms

Other hypernyms of physiology include biological science.

physiology (noun)	biology (noun)
processes and functions of an organism	the science that studies living organisms
the branch of the biological sciences dealing with the functioning of organisms	all the plant and animal life of a particular region
	characteristic life processes and phenomena of living organisms