Problem: What are the most important words?
A snowboarder and skier trekking home after a day in the snow.
Answer: day, snow, trek

Problem: What are the most important words?
escalators with shoppers descending into a multi shopping mall
Answer: descend, escalator, mall

Problem: What are the most important words?
how scale and proportion bring balance to a room
Answer:
balance, bring, proportion, room