rehearsal vs psychological science

rehearsal and psychological science both are nouns.

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

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