What part of speech is doctrine?

"Doctrine" can be several parts of speech, depending on how it's used in a sentence:

* Noun: This is the most common usage. It refers to a belief or set of beliefs, especially one held by a religious or political group.

* Example: "The church's doctrine on salvation is complex."

* Adjective: It can be used to describe something related to a doctrine.

* Example: "The doctrine meeting was held in the main hall."

* Verb: While less common, "doctrine" can be used as a verb meaning "to teach or instruct in a doctrine."

* Example: "The professor doctrined his students on the history of philosophy."

So, to determine the part of speech, you need to consider the context in which "doctrine" is used.