Problem: What are the most important words?
pilots in a helicopter flying on a sunny day
Answer: fly, helicopter, pilot

Problem: What are the most important words?
the statue of liberty surrounded by scaffolding as workers complete the final stages .
Answer: complete, liberty, scaffold, statue, surround

Problem: What are the most important words?
A man playing scrabble with carrots, celery, onions, limes, apples and cauliflower, with an alien.
Answer:
carrot, cauliflower, celery, lime, onion