Problem: What are the most important words?
A woman tossing a frisbee in the front yard.
Answer: frisbee, toss, yard

Problem: What are the most important words?
sea of clouds obscuring tourist attraction
Answer: attraction, cloud, sea

Problem: What are the most important words?
A man cooks as a man stares off into space, a box of butter is in the foreground.
Answer:
box, butter, cook, foreground, space