ski jump vs athletics

ski jump and athletics both are nouns.

Word	Noun	Adjective	Verb	Adverb
ski jump	Yes	No	Yes	No
athletics	Yes	No	No	No

ski jump (noun)	athletics (noun)
a steep downward ramp from which skiers jump	an active diversion requiring physical exertion and competition
	participation in sports events as an extracurricular activity
	a contest between athletes

ski jump (verb)	athletics (verb)
jump on skis