What part of speech is the word familiar?

The word "familiar" can be several parts of speech depending on how it's used in a sentence:

* Adjective: Describing something or someone that is known or recognized.

* Example: "The old man had a familiar face."

* Noun: Referring to a person or thing that is known or recognized.

* Example: "He was a familiar at the coffee shop."

* Verb: Meaning to make someone or something familiar with something else.

* Example: "She familiarized herself with the new software."

So, without more context, it's impossible to definitively say which part of speech "familiar" is.