fight vs armed combat

fight and armed combat both are nouns.

Word	Noun	Adjective	Verb	Adverb
fight	Yes	No	Yes	No
armed combat	Yes	No	No	No

As nouns, armed combat is a hyponym of fight; that is, armed combat is a word with a more specific, narrower meaning than fight:

Other hyponyms of fight include Armageddon, pitched battle, naval battle, combat, dogfight, assault.

fight (noun)	armed combat (noun)
a hostile meeting of opposing military forces in the course of a war	an engagement fought between two military forces
the act of fighting; any contest or struggle
a boxing or wrestling match
an aggressive willingness to compete
an intense verbal dispute

fight (verb)	armed combat (verb)
be engaged in a fight; carry on a fight
fight against or resist strongly
make a strenuous or labored effort
exert oneself continuously, vigorously, or obtrusively to gain an end or engage in a crusade for a certain cause or person; be an advocate for