archaic vs antiquated

archaic and antiquated both are adjectives.

Word	Noun	Adjective	Verb	Adverb
archaic	No	Yes	No	No
antiquated	No	Yes	No	No

As adjectives, archaic and antiquated are synonyms defined as:

archaic and antiquated: so extremely old as seeming to belong to an earlier period

Other synonyms of archaic include antediluvian.

archaic (adjective)	antiquated (adjective)
little evolved from or characteristic of an earlier ancestral type	so extremely old as seeming to belong to an earlier period
so extremely old as seeming to belong to an earlier period