1) Film writer 2) Scriptwriter 3) Writing occupation 1) Lucas 2) Scenarist 3) Trumbo 
A screenplay writer, screenwriter for short, or scriptwriter or scenarist is a writer who practices the craft of screenwriting, writing screenplays on which mass media such as films, television programs, comics or video games are based. ==Profession== Screenwriting is a freelance profession. No education is required to become a professional screen...
[n] - someone who writes screenplays
film writer noun someone who writes screenplays
Screenwriters write stories in the form of a script, or screenplay, to be presented on television, or in film. They may be hired to convert a novel into a screenplay, or they may write their own original pieces.
A person who either adapts stories or writes screenplays for film.