What is more important images or words?

I think that the images within film posters give away more of an idea about the film and have a higher representation about the film. The reason i think the images are more effective is because words can have double meanings and not all words will set the genre which is very important for a film, For example "Case 39" sounds like a crime or thriller however the film is a horror. With the image of case 39 we can get an idea that it may be horror with the glow and the dark background.

In conclusion I think that the images are more effective then words and every film poster must rely on its images to represent the film and its genre as opposed to the words.