Problem: What are the most important words?
woman on the moving escalator in the metro
Answer: escalator, metro, move

Problem: What are the most important words?
two men in suits host an event and talk about something
Answer: event, suit, talk

Problem: What are the most important words?
A man is making sandwiches by placing slices of cucumbers and tomatoes on the bread.
Answer:
cucumber, sandwich, slice, tomato