call fire vs firing

call fire and firing both are nouns.

Word	Noun	Adjective	Verb	Adverb
call fire	Yes	No	No	No
firing	Yes	No	No	No

As nouns, firing is a hypernym of call fire; that is, firing is a word with a broader meaning than call fire:

call fire: fire delivered on a specific target in response to a request from the supported unit
firing: the act of firing weapons or artillery at an enemy

Other hypernyms of call fire include fire.

call fire (noun)	firing (noun)
fire delivered on a specific target in response to a request from the supported unit	the act of setting something on fire
	the termination of someone's employment (leaving them free to depart)
	the act of discharging a gun
	the act of firing weapons or artillery at an enemy