athletics vs jackknife

athletics and jackknife both are nouns.

Word	Noun	Adjective	Verb	Adverb
athletics	Yes	No	No	No
jackknife	Yes	No	Yes	No

athletics (noun)	jackknife (noun)
an active diversion requiring physical exertion and competition	a dive in which the diver bends to touch the ankles before straightening out
participation in sports events as an extracurricular activity	a large knife with one or more folding blades
a contest between athletes

athletics (verb)	jackknife (verb)
	dive into the water bending the body at the waist at a right angle, like a jackknife