Problem: What are the most important words?
pharmacist assisting the bottle of drug to customer in pharmacy
Answer: assist, pharmacist, pharmacy

Problem: What are the most important words?
Several giraffes wandering around their zoo enclosure while people watch.
Answer: enclosure, giraffes, watch

Problem: What are the most important words?
politician holding a brick during his speech to delegates at the annual conference .
Answer:
hold, politician, speech