familiarity vs acquaintance

familiarity and acquaintance both are nouns.

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

As nouns, familiarity and acquaintance are synonyms defined as:

familiarity and acquaintance: personal knowledge or information about someone or something

Other synonyms of familiarity include conversance, conversancy.

familiarity (noun)	acquaintance (noun)
an act of undue intimacy	personal knowledge or information about someone or something
usualness by virtue of being familiar or well known	a person with whom you are acquainted
close or warm friendship	a relationship less intimate than friendship
a casual manner
personal knowledge or information about someone or something