familiar vs usual

familiar is a noun but usual is not a noun.

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

familiar (noun)	usual (noun)
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

familiar (adjective)	usual (adjective)
well known or easily recognized	occurring or encountered or experienced or observed frequently or in accordance with regular practice or procedure
within normal everyday experience; common and ordinary; not strange	commonly encountered
having mutual interests or affections; of established friendship
(usually followed by `with') well informed about or knowing thoroughly