engagement vs combat

engagement and combat both are nouns.

Word	Noun	Adjective	Verb	Adverb
engagement	Yes	No	No	No
combat	Yes	No	Yes	No

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

engagement: a hostile meeting of opposing military forces in the course of a war
combat: an engagement fought between two military forces

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

engagement (noun)	combat (noun)
the act of sharing in the activities of a group	an engagement fought between two military forces
a hostile meeting of opposing military forces in the course of a war	the act of fighting; any contest or struggle
the act of giving someone a job
employment for performers or performing groups that lasts for a limited period of time
a mutual promise to marry
contact by fitting together
a meeting arranged in advance

engagement (verb)	combat (verb)
	battle or contend against in or as if in a battle