Problem: What are the most important words?
Three men are trying to play the pan flute and when they stop, one guy says thank you.
Answer: say, stop, thank

Problem: What are the most important words?
Two teams participating in what appears to be the sport of hurling, get into a small fight.
Answer: participate, sport, team

Problem: What are the most important words?
aerial footage of traffic in the city
Answer:
city, footage, traffic