rehearse vs practice

rehearse is not a noun while practice is a noun.

Word	Noun	Adjective	Verb	Adverb
rehearse	No	No	Yes	No
practice	Yes	No	Yes	No

As verbs, rehearse and practice are synonyms defined as:

Other synonyms of rehearse include practise.

rehearse (noun)	practice (noun)
	a customary way of operation or behavior
	systematic training by multiple repetitions
	the exercise of a profession
	translating an idea into action
	knowledge of how something is usually done

rehearse (verb)	practice (verb)
engage in a rehearsal (of)	learn by repetition
	engage in a rehearsal (of)
	carry out or practice; as of jobs and professions
	avail oneself to
	engage in or perform