removal vs firing

removal and firing both are nouns.

Word	Noun	Adjective	Verb	Adverb
removal	Yes	No	No	No
firing	Yes	No	No	No

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

removal: dismissal from office
firing: the termination of someone's employment (leaving them free to depart)

Other hypernyms of removal include discharge, dismissal, dismission, liberation, release, sack, sacking.

removal (noun)	firing (noun)
the act of removing	the act of setting something on fire
dismissal from office	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