What is the noun in this sentence museum tells about history of airplanes?

The noun in the sentence "Museum tells about the history of airplanes" is museum.

Here's why:

* Museum is the subject of the sentence, meaning it is the thing performing the action (telling).

* History is an abstract noun and is part of the prepositional phrase "about the history of airplanes."

* Airplanes is a plural noun and is also part of the prepositional phrase.