spar vs mast

spar and mast both are nouns.

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

As nouns, mast is a hyponym of spar; that is, mast is a word with a more specific, narrower meaning than spar:

Other hyponyms of spar include boom, bowsprit, dolphin striker, martingale, gaff, jibboom, sprit, yard.

spar (noun)	mast (noun)
making the motions of attack and defense with the fists and arms; a part of training for a boxer	a vertical spar for supporting sails
a stout rounded pole of wood or metal used to support rigging	any sturdy upright pole
any of various nonmetallic minerals (calcite or feldspar) that are light in color and transparent or translucent and cleavable	nuts of forest trees used as feed for swine
	nuts of forest trees (as beechnuts and acorns) accumulated on the ground