psychological science vs rehearsal

psychological science and rehearsal both are nouns.

Word	Noun	Adjective	Verb	Adverb
psychological science	Yes	No	No	No
rehearsal	Yes	No	No	No

psychological science (noun)	rehearsal (noun)
the science of mental life	(psychology) a form of practice; repetition of information (silently or aloud) in order to keep it in short-term memory
	a practice session in preparation for a public performance (as of a play or speech or concert)