armor vs fit out

armor is a noun but fit out is not a noun.

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

As verbs, fit out is a hypernym of armor; that is, fit out is a word with a broader meaning than armor:

Other hypernyms of armor include equip, fit, outfit.

armor (noun)	fit out (noun)
tough more-or-less rigid protective covering of an animal or plant
protective covering made of metal and used in combat
a military unit consisting of armored fighting vehicles

armor (verb)	fit out (verb)
equip with armor	provide with clothes or put clothes on
	provide with (something) usually for a specific purpose