spar vs jibboom

spar and jibboom both are nouns.

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

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

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

spar (noun)	jibboom (noun)
making the motions of attack and defense with the fists and arms; a part of training for a boxer	a spar that extends the bowsprit
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