The term 'metonym for the movie industry' can be summarized as 'SCREEN', a six-letter word. A metonym is a figure of speech in which a thing or concept is referred to by the name of something closely associated with it. In this case, the movie industry is being referred to by the word 'SCREEN', which is closely associated with it. The SCREEN is the physical surface on which movies are projected and viewed, and thus serves as an appropriate metonym for the movie industry.