Problem: What are the most important words?
soldier keeps security during a patrol in a village
Answer: security, soldier, village

Problem: What are the most important words?
part of a white tiled wall on the exterior of an urban building
Answer: building, part, wall

Problem: What are the most important words?
a student takes notes from her textbook as other medical students gather behind her in a classroom .
Answer:
classroom, note, take