high-tech vs hi-tech

high-tech and hi-tech both are adjectives.

Word	Noun	Adjective	Verb	Adverb
high-tech	No	Yes	No	No
hi-tech	No	Yes	No	No

As adjectives, high-tech and hi-tech are synonyms defined as:

high-tech and hi-tech: resembling or making use of highly advanced technology or devices

high-tech (adjective)	hi-tech (adjective)
resembling or making use of highly advanced technology or devices	resembling or making use of highly advanced technology or devices