What is the difference?
The major difference between the two words “stationary” and “stationery” is the definitions and contexts in which they are used.
“Stationary” is an adjective that means that the subject matter is not moving or is incapable of moving or is fixed or permanently located in a fixed position.
Nevertheless, “stationery” is a noun that means the materials needed for writing, and office materials mostly deal with writing things.