1, when used as a noun: paper; Documents; Newspapers; Thesis; Bills; Wallpaper.

2. When used as a verb: wrap it in paper; Paste with paper; Wallpaper.

3. When used as an adjective: paper; Paper; In name only.

An example of "paper"

1, when used as a noun:

That paper has turned yellow because of its age.

That paper has turned yellow with age.

This letter is written on a piece of paper.

This letter is only written on a piece of paper.

2. When used as a verb:

(1) Striped wallpaper from the Regency period is pasted on the wall.

The wall is pasted with wallpaper with equal width color stripes.

The bad feelings between her and Jenny must have been covered up.

The hostility between her and Jenny must have been covered up.

3. When used as adjectives:

(1) These apartments have paper walls.

The walls of these apartment rooms are very thin.

(2) It's just a promise.

This is just a dead letter.