Definition of a screenplay:

“is a written work by screenwriters for a film, television show, or video game. Screenplays can be original works or adaptations from existing pieces of writing.” – including acting directions

– https://en.wikipedia.org/wiki/Screenplay

Example of a film with excellent screenplay:

Dif. Between screenplay and script:

Screenplay refers to anything to be played on screen such as the narrative and is more aimed for the use by the director, whereas a script is a written text that includes dialogue between characters (more technical elements).