boxing vs contact sport

boxing and contact sport both are nouns.

Word	Noun	Adjective	Verb	Adverb
boxing	Yes	No	No	No
contact sport	Yes	No	No	No

As nouns, contact sport is a hypernym of boxing; that is, contact sport is a word with a broader meaning than boxing:

boxing: fighting with the fists
contact sport: a sport that necessarily involves body contact between opposing players

boxing (noun)	contact sport (noun)
fighting with the fists	a sport that necessarily involves body contact between opposing players
the enclosure of something in a package or box