* Adjective: This is the most common usage, describing something that is well-known or easily recognized.
* Example: "We have a familiar routine."
* Noun: This refers to someone or something that is well-known.
* Example: "He's a familiar face around here."
* Verb: This means to make someone or something familiar with something.
* Example: "I'm familiarizing myself with the new software."
So, to determine the correct part of speech, you need to consider the context of the sentence.