high tech vs automation

high tech and automation both are nouns.

Word	Noun	Adjective	Verb	Adverb
high tech	Yes	No	No	No
automation	Yes	No	No	No

As nouns, automation is a hyponym of high tech; that is, automation is a word with a more specific, narrower meaning than high tech:

high tech: highly advanced technological development (especially in electronics)
automation: the act of implementing the control of equipment with advanced technology; usually involving electronic hardware

Other hyponyms of high tech include mechanisation, mechanization.

high tech (noun)	automation (noun)
highly advanced technological development (especially in electronics)	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