No, not every word in a movie title is capitalized. Typically, only the first word and proper nouns are capitalized in a movie title.
Leap year
Nails is the title of a 2017 horror movie.
Dr. No
Up
Jordan Boulton
Girl with a Pearl Earring (2003).
Since you didn't tell what the word was, how can anyone answer?
The word 'Братья' is a Russian equivalent to the title of the movie 'Brothers'.
rango and tango or sango get me
Home Alone ,
Fantastic Four