removal vs sacking

removal and sacking both are nouns.

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

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

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

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

removal (noun)	sacking (noun)
the act of removing	the termination of someone's employment (leaving them free to depart)
dismissal from office	coarse fabric used for bags or sacks