old vs familiar

old and familiar both are nouns.

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

old (noun)	familiar (noun)
past times	a spirit (usually in animal form) that acts as an assistant to a witch or wizard
	a person attached to the household of a high official (as a pope or bishop) who renders service in return for support
	a friend who is frequently in the company of another

old (adjective)	familiar (adjective)
of long duration; not new	well known or easily recognized
(used especially of persons) having lived for a relatively long time or attained a specific age	within normal everyday experience; common and ordinary; not strange
skilled through long experience	having mutual interests or affections; of established friendship
(used for emphasis) very familiar	(usually followed by `with') well informed about or knowing thoroughly
excellent
just preceding something else in time or order
belonging to some prior time