What is another word for acquaintance?

Here are some other words for acquaintance, depending on the specific nuance you want to convey:

Formal:

* Associate

* Contact

* Connection

* Fellow

* Friend (informal)

Informal:

* Buddy

* Pal

* Mate

* Known

* Known to

More specific:

* Colleague (work-related)

* Neighbor (residential)

* Classmate (school)

* Customer (business)

* Client (professional)

The best word to use depends on the context and the level of familiarity you have with the person.