rehearsal vs practice session

rehearsal and practice session both are nouns.

Word	Noun	Adjective	Verb	Adverb
rehearsal	Yes	No	No	No
practice session	Yes	No	No	No

As nouns, practice session is a hypernym of rehearsal; that is, practice session 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
practice session: systematic training by multiple repetitions

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

As nouns, practice session is a hypernym of rehearsal; that is, practice session 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)
practice session: systematic training by multiple repetitions

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

rehearsal (noun)	practice session (noun)
(psychology) a form of practice; repetition of information (silently or aloud) in order to keep it in short-term memory	systematic training by multiple repetitions
a practice session in preparation for a public performance (as of a play or speech or concert)