* Verb: This is the most common use of "join." It means to connect with something or someone else.
* Example: "Please join us for dinner."
* Noun: This is less common, but "join" can refer to the act of joining or a place where things are joined.
* Example: "The join in the wood was strong."
* Adjective: This is also rare, but "join" can be used as an adjective to describe something that is related to joining.
* Example: "The join committee met to discuss the merger."
To know which part of speech "join" is, you need to look at how it's used in the sentence.