Flies and Fly ball

Flies noun - Theater) the space over the stage (out of view of the audience) used to store scenery (drop curtains.

Fly ball is a synonym for flies. In some cases you can use "Fly ball" instead a noun "Flies".

Fly ball noun - (baseball) a hit that flies up in the air.

Flies is a synonym for fly ball. Sometimes you can replace term "Flies" with "Fly ball", this terms are similar.