scheduled fire vs firing

scheduled fire and firing both are nouns.

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

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

Other hypernyms of scheduled fire include fire.

scheduled fire (noun)	firing (noun)
prearranged fire delivered at a predetermined time	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