What part of speech is the word stationary?

The word "stationary" can be two different parts of speech depending on its context:

* Adjective: When it describes something that is not moving or in a fixed position, it acts as an adjective. For example: "The car is stationary."

* Noun: When it refers to writing materials such as paper, envelopes, and pens, it acts as a noun. For example: "The office supplies are in the stationary cupboard."

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