How do they call "stationary" or "letter paper" in Japanese?

Question:

Answer:

Stationary could be 文房具 (bun bohgu), but it include many things like pencils, erasers, ruler, etc...
If you wish to specified on latter paper for personal letter, you should say 便箋　(bin sen) .
If you meant paper which used for school projects, or business レポート用紙　(repohto youshi) is good word.