Problem: What are the most important words?
A few students are trying to pass their math exam.
Answer: exam, pass, student

Problem: What are the most important words?
pilgrims taking a holy bath in the sea at sunrise
Answer: bath, pilgrim, sea, sunrise, take

Problem: What are the most important words?
buildings and rooftop as seen perched high above the city
Answer:
building, perch, rooftop