blood sport vs athletics

blood sport and athletics both are nouns.

Word	Noun	Adjective	Verb	Adverb
blood sport	Yes	No	No	No
athletics	Yes	No	No	No

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

Other hypernyms of blood sport include sport.

blood sport (noun)	athletics (noun)
sport that involves killing animals (especially hunting)	an active diversion requiring physical exertion and competition
	participation in sports events as an extracurricular activity
	a contest between athletes