Problem: What are the most important words?
A yellow toilet sitting inside of a bathroom inside of a stall.
Answer: bathroom, sit, stall, toilet

Problem: What are the most important words?
an unfinished apartment building made of reinforced concrete
Answer: building, concrete, reinforce

Problem: What are the most important words?
vines grow up the wall of a building in an alley
Answer:
alley, grow, wall