psychology vs science

psychology and science both are nouns.

Word	Noun	Adjective	Verb	Adverb
psychology	Yes	No	No	No
science	Yes	No	No	No

As nouns, science is a hypernym of psychology; that is, science is a word with a broader meaning than psychology:

Other hypernyms of psychology include scientific discipline.

psychology (noun)	science (noun)
the science of mental life	a particular branch of scientific knowledge
	ability to produce solutions in some problem domain