concert vs rehearsal

concert and rehearsal both are nouns.

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

concert (noun)	rehearsal (noun)
a performance of music by players or singers not involving theatrical staging	(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)

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