Yes, it is.
Metonymy is a figure of speech in which a thing or concept is not called by its own name, but by the name of something closely related to that thing.
Eg :- The pen is mightier than the sword.
Here, the “pen” stands for “the written word”and the “sword” stands for “military aggression and force.”
Read more at http://examples.yourdictionary.com/examples-of-metonymy.htmlRy9czCUVRBZJUZrH.99