military greeting vs salutation

military greeting and salutation both are nouns.

Word	Noun	Adjective	Verb	Adverb
military greeting	Yes	No	No	No
salutation	Yes	No	No	No

As nouns, salutation is a hypernym of military greeting; that is, salutation is a word with a broader meaning than military greeting:

military greeting: a formal military gesture of respect
salutation: (usually plural) an acknowledgment or expression of good will (especially on meeting)

Other hypernyms of military greeting include greeting.

military greeting (noun)	salutation (noun)
a formal military gesture of respect	(usually plural) an acknowledgment or expression of good will (especially on meeting)
	an act of honor or courteous recognition
	word of greeting used to begin a letter