fit out vs spar

fit out is not a noun while spar is a noun.

Word	Noun	Adjective	Verb	Adverb
fit out	No	No	Yes	No
spar	Yes	No	Yes	No

As verbs, spar is a hyponym of fit out; that is, spar is a word with a more specific, narrower meaning than fit out:

fit out (noun)	spar (noun)
	making the motions of attack and defense with the fists and arms; a part of training for a boxer
	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

fit out (verb)	spar (verb)
provide with clothes or put clothes on	fight verbally
provide with (something) usually for a specific purpose	box lightly
	fight with spurs
	furnish with spars