rehearsal vs exercise

rehearsal and exercise both are nouns.

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

As nouns, exercise is a hypernym of rehearsal; that is, exercise is a word with a broader meaning than rehearsal:

rehearsal: (psychology) a form of practice; repetition of information (silently or aloud) in order to keep it in short-term memory
exercise: systematic training by multiple repetitions

Other hypernyms of rehearsal include drill, practice, practice session, recitation.

As nouns, exercise is a hypernym of rehearsal; that is, exercise is a word with a broader meaning than rehearsal:

rehearsal: a practice session in preparation for a public performance (as of a play or speech or concert)
exercise: systematic training by multiple repetitions

Other hypernyms of rehearsal include drill, practice, practice session, recitation.

rehearsal (noun)	exercise (noun)
(psychology) a form of practice; repetition of information (silently or aloud) in order to keep it in short-term memory	the activity of exerting your muscles in various ways to keep fit
a practice session in preparation for a public performance (as of a play or speech or concert)	a task performed or problem solved in order to develop skill or understanding
	systematic training by multiple repetitions
	the act of using
	an action, often used negatively and without consequences
	(usually plural) a ceremony that involves processions and speeches

rehearsal (verb)	exercise (verb)
	do physical exercise
	give a workout to
	learn by repetition
	put to use
	carry out or practice; as of jobs and professions