What's the noun for acquaintant? Here's the word you're looking for.
acquaintance
(uncountable) 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 intimacy
(countable) A person or persons with whom one is acquainted.
“To give an example from the purely personal level, an elderly female acquaintance of mine does not drink coffee.”
“Now, because of her acquaintance with Moher, Zalie was looked at as if she were one of the most important people ever born.”
“Should the rest of us trust what we see on television when our acquaintance with a case is confined to that little bit of testimony that is billed as a confession?”
“All past acquaintanceships, friendships, love affairs, punch-ups, and the like must be cast from the judges' minds.”
“As a result, we have become very insular, and my parents in particular have found it difficult to form lasting friendships, or indeed temporary acquaintanceships.”