spar vs athletics

spar and athletics both are nouns.

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

spar (noun)	athletics (noun)
making the motions of attack and defense with the fists and arms; a part of training for a boxer	an active diversion requiring physical exertion and competition
a stout rounded pole of wood or metal used to support rigging	participation in sports events as an extracurricular activity
any of various nonmetallic minerals (calcite or feldspar) that are light in color and transparent or translucent and cleavable	a contest between athletes