spar vs martingale

spar and martingale both are nouns.

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

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

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

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