What part of speech is automatic?

"Automatic" can be several parts of speech depending on how it's used:

* Adjective: Describes something that happens or works by itself without needing control or effort.

* Example: "This door has an automatic opener."

* Noun: Refers to a process or system that happens without human intervention.

* Example: "The automatic pilot flew the plane."

* Adverb: Describes how something happens, indicating it happens spontaneously or without thinking.

* Example: "The door opened automatically."

So, the part of speech depends on its function in the sentence.