Problem: What are the most important words?
aerial shot of green wheat fields with cloudy sky and shadows from the clouds .
Answer: cloud, shadow, shot

Problem: What are the most important words?
the stingray leaps out of the water as it is hunted by a killer whale
Answer: leap, water, whale

Problem: What are the most important words?
A harbor filled with lots of boats next to a building.
Answer:
boat, building, fill, harbor, lot