Problem: What are the most important words?
a traditional working narrowboat approaching lock of the flight of locks
Answer: approach, lock, narrowboat

Problem: What are the most important words?
An Emirates commercial plane is preparing to taxi down the runway at an airport on a cloudy day.
Answer: day, plane, runway, taxi

Problem: What are the most important words?
paintings of horses hang on the walls .
Answer:
hang, painting, wall