Familiarity
Part of speech: noun
Definition: The state of being extremely friendly; intimacy. Undue intimacy. Sexual intimacy. Informality; impertinence. An instance of familiar behaviour. Close or habitual acquaintance with someone; recognizability.
Example sentence: Whenever you speak to someone, you are presuming the two of you have a certain degree of familiarity - which your words might alter. So every sentence has to do two things at once: convey a message and continue to negotiate that relationship.
Acquaintance
Part of speech: noun
Definition: A state of being acquainted, or of having intimate, or more than slight or superficial, knowledge; personal knowledge gained by intercourse short of that of friendship or intimacyA person or persons with whom one is acquainted.
Example sentence: You can gain in your effectiveness as a politician from a wide acquaintance with the world and from a degree of independence that having some outside interests gives.