rehearsal vs drill

rehearsal and drill both are nouns.

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

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

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

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

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

rehearsal (noun)	drill (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)	(military) the training of soldiers to march (as in ceremonial parades) or to perform the manual of arms
	similar to the mandrill but smaller and less brightly colored
	a tool with a sharp point and cutting edges for making holes in hard materials (usually rotating rapidly or by repeated blows)

rehearsal (verb)	drill (verb)
	learn by repetition
	teach by repetition
	train in the military, e.g., in the use of weapons
	undergo military training or do military exercises
	make a hole, especially with a pointed power or hand tool