spar vs dolphin striker

spar and dolphin striker both are nouns.

Word	Noun	Adjective	Verb	Adverb
spar	Yes	No	Yes	No
dolphin striker	Yes	No	No	No

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

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

spar (noun)	dolphin striker (noun)
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