computerization vs automation

computerization and automation both are nouns.

Word	Noun	Adjective	Verb	Adverb
computerization	Yes	No	No	No
automation	Yes	No	No	No

As nouns, automation is a hypernym of computerization; that is, automation is a word with a broader meaning than computerization:

computerization: the control of processes by computer
automation: the act of implementing the control of equipment with advanced technology; usually involving electronic hardware

Other hypernyms of computerization include mechanisation, mechanization.

computerization (noun)	automation (noun)
the control of processes by computer	the act of implementing the control of equipment with advanced technology; usually involving electronic hardware
	equipment used to achieve automatic control or operation
	the condition of being automatically operated or controlled