Problem: What are the most important words?
black color perched on a tree in the garden
Answer: color, garden, tree

Problem: What are the most important words?
boxer of waves to his fans after defeating boxer during the heavyweight fight .
Answer: boxer, fan, fight

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