Meaning : A person you know well and regard with affection and trust.
He was my best friend at the university.
Meaning : A person with whom you are acquainted.
I have trouble remembering the names of all my acquaintances.
We are friends of the family.
Synonyms : acquaintance
Meaning : A member of the Religious Society of Friends founded by George Fox (the Friends have never called themselves Quakers).
Synonyms : quaker