familiar vs common

familiar and common both are nouns.

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

familiar (noun)	common (noun)
a spirit (usually in animal form) that acts as an assistant to a witch or wizard	a piece of open land for recreational use in an urban area
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)	common (adjective)
well known or easily recognized	having no special distinction or quality; widely known or commonly encountered; average or ordinary or usual
within normal everyday experience; common and ordinary; not strange	belonging to or participated in by a community as a whole; public
having mutual interests or affections; of established friendship	commonly encountered
(usually followed by `with') well informed about or knowing thoroughly	of low or inferior quality or value
	being or characteristic of or appropriate to everyday language
	of or associated with the great masses of people
	to be expected; standard
	common to or shared by two or more parties
	lacking refinement or cultivation or taste