What part of speech is the word train?

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

* Noun: A long, narrow vehicle that travels on rails.

* Example: The train arrived late.

* Verb: To teach or prepare someone or something for a specific purpose.

* Example: She trained for the marathon.

* Verb: To draw or pull something behind.

* Example: The dog trained its tail behind it.

To figure out which part of speech "train" is, look at the sentence and how the word is being used.