familiarity vs informality

familiarity and informality both are nouns.

Word	Noun	Adjective	Verb	Adverb
familiarity	Yes	No	No	No
informality	Yes	No	No	No

As nouns, informality is a hypernym of familiarity; that is, informality is a word with a broader meaning than familiarity:

familiarity (noun)	informality (noun)
an act of undue intimacy	a manner that does not take forms and ceremonies seriously
usualness by virtue of being familiar or well known	freedom from constraint or embarrassment
close or warm friendship
a casual manner
personal knowledge or information about someone or something