Problem: What are the most important words?
Cattle walking on roadway with vehicles traveling nearby.
Answer: roadway, travel, vehicle

Problem: What are the most important words?
the event is in its eleventh year and is held in cities across the world
Answer: event, hold, world

Problem: What are the most important words?
Young ladies working on their computers, studying and relaxing at the same time.
Answer:
lady, relax, time