ancient vs old

ancient and old both are nouns.

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

ancient (noun)	old (noun)
a person who lived in ancient times	past times
a very old person

ancient (adjective)	old (adjective)
very old	of long duration; not new
belonging to times long past especially of the historical period before the fall of the Western Roman Empire	(used especially of persons) having lived for a relatively long time or attained a specific age
	skilled through long experience
	(used for emphasis) very familiar
	excellent
	just preceding something else in time or order
	belonging to some prior time