old vs archaic

old is a noun but archaic is not a noun.

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

old (noun)	archaic (noun)
past times

old (adjective)	archaic (adjective)
of long duration; not new	little evolved from or characteristic of an earlier ancestral type
(used especially of persons) having lived for a relatively long time or attained a specific age	so extremely old as seeming to belong to an earlier period
skilled through long experience
(used for emphasis) very familiar
excellent
just preceding something else in time or order
belonging to some prior time