What part of a speech is shown on the dictionary entry for this word countenance?

The dictionary entry for "countenance" will show it as a noun.

Here's why:

* Countenance primarily refers to a person's face or facial expression. For example, "Her countenance was filled with joy."

* While it can sometimes be used as a verb (meaning to tolerate or support), this meaning is less common and usually not the primary definition listed in a dictionary.

Therefore, when looking up "countenance" in a dictionary, you'll find it listed as a noun.