* Noun: A set of two things that are similar or meant to be used together.
* Example: "I bought a new pair of shoes."
* Verb: To join two things together.
* Example: "We paired the red wine with the cheese."
* Adjective: Being in a set of two.
* Example: "We have a pair of matching earrings."
So, the part of speech for "pair" depends on the context of the sentence.