Problem: What are the most important words?
Several suitcases piled on luggage carts at an airport.
Answer: airport, cart, pile, suitcase

Problem: What are the most important words?
Two young men, dressed similar to characters from Skyrim, are fighting with fake weapons.
Answer: character, dress, fight

Problem: What are the most important words?
little bear flying with blue balloons and the words happy birthday
Answer:
balloon, fly, word