adaptation vs physiology

adaptation and physiology both are nouns.

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

adaptation (noun)	physiology (noun)
(physiology) the responsive adjustment of a sense organ (as the eye) to varying conditions (as of light)	processes and functions of an organism
a written work (as a novel) that has been recast in a new form	the branch of the biological sciences dealing with the functioning of organisms
the process of adapting to something (such as environmental conditions)