Problem: What are the most important words?
Trains pull into a train station during the day.
Answer: day, station, train

Problem: What are the most important words?
close up green sea turtle swimming away from a coral reef
Answer: close, swim, turtle

Problem: What are the most important words?
A student hits another student in a classroom, and then the teacher hits that student in the head.
Answer:
hit, student, teacher