rehearsal vs dry run

rehearsal and dry run both are nouns.

Word	Noun	Adjective	Verb	Adverb
rehearsal	Yes	No	No	No
dry run	Yes	No	No	No

As nouns, rehearsal and dry run are synonyms defined as:

rehearsal and dry run: a practice session in preparation for a public performance (as of a play or speech or concert)

rehearsal (noun)	dry run (noun)
(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)
a practice session in preparation for a public performance (as of a play or speech or concert)