Problem: What are the most important words?
a student works with the help of his teacher at a computer
Answer: computer, help, student, work

Problem: What are the most important words?
week old male foal lying down resting in a paddock with grass and dandelions
Answer: dandelion, foal, grass, lie, rest

Problem: What are the most important words?
comic book based on the movie
Answer:
base, book, movie