rehearsal vs concert

rehearsal and concert both are nouns.

Word	Noun	Adjective	Verb	Adverb
rehearsal	Yes	No	No	No
concert	Yes	No	Yes	No

rehearsal (noun)	concert (noun)
(psychology) a form of practice; repetition of information (silently or aloud) in order to keep it in short-term memory	a performance of music by players or singers not involving theatrical staging
a practice session in preparation for a public performance (as of a play or speech or concert)

rehearsal (verb)	concert (verb)
	settle by agreement
	contrive (a plan) by mutual agreement