practice vs scrimmage

practice and scrimmage both are nouns.

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

As nouns, scrimmage is a hyponym of practice; that is, scrimmage is a word with a more specific, narrower meaning than practice:

practice: systematic training by multiple repetitions
scrimmage: (American football) practice play between a football team's squads

As verbs, scrimmage is a hyponym of practice; that is, scrimmage is a word with a more specific, narrower meaning than practice:

Other hyponyms of practice include walk through.

practice (noun)	scrimmage (noun)
a customary way of operation or behavior	a noisy riotous fight
systematic training by multiple repetitions	(American football) practice play between a football team's squads
the exercise of a profession
translating an idea into action
knowledge of how something is usually done

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