martingale vs spar

martingale and spar both are nouns.

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

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

martingale (noun)	spar (noun)
a harness strap that connects the nose piece to the girth; prevents the horse from throwing back its head	making the motions of attack and defense with the fists and arms; a part of training for a boxer
spar under the bowsprit of a sailboat	a stout rounded pole of wood or metal used to support rigging
	any of various nonmetallic minerals (calcite or feldspar) that are light in color and transparent or translucent and cleavable