spar vs boxing

spar and boxing both are nouns.

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

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

spar: making the motions of attack and defense with the fists and arms; a part of training for a boxer
boxing: fighting with the fists

Other hypernyms of spar include fisticuffs, pugilism.

spar (noun)	boxing (noun)
making the motions of attack and defense with the fists and arms; a part of training for a boxer	fighting with the fists
a stout rounded pole of wood or metal used to support rigging	the enclosure of something in a package or box
any of various nonmetallic minerals (calcite or feldspar) that are light in color and transparent or translucent and cleavable