* Adjective: This is the most common use of "other." It describes a noun.
* Example: "I have other plans for tonight."
* Pronoun: It can stand in place of a noun, usually when the noun has been mentioned previously.
* Example: "I don't like this one. Can I see the other?"
* Determiner: It precedes a noun and indicates a specific item.
* Example: "Please give me the other book."
So, without more context, it's hard to say definitively what part of speech "other" is.