Problem: What are the most important words?
storm clouds in bad weather over rough sea with breaking waves off the coast
Answer: coast, sea, weather

Problem: What are the most important words?
There are some stuffed bears arranged by some small trees
Answer: arrange, bear, tree

Problem: What are the most important words?
an aircraft moves into position to receive fuel from cargo aircraft during a mission over country .
Answer:
aircraft, fuel, mission, position, receive