Which of the following words can be an adverb, wall, upstairs, house, basement?

Wall can be an adverb.

Explanation:

An Adverb is a verb that can be serving as an adjective.

To fall into this category the word will have to do both of the things together

To check which ones of these can do it we must try to make the sense of the words when an verb is being made out of them.

Out of all the words here, the one that makes the most sense as a verb is indeed wall.

It can be walled or walling and mean being restricting or restrictive.

The word here clearly is functioning like an adverb.