concentrated fire vs firing

concentrated fire and firing both are nouns.

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

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

concentrated fire: fire from two or more weapons directed at a single target or area (as fire by batteries of two or more warships)
firing: the act of firing weapons or artillery at an enemy

Other hypernyms of concentrated fire include fire.

concentrated fire (noun)	firing (noun)
fire from two or more weapons directed at a single target or area (as fire by batteries of two or more warships)	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