Problem: What are the most important words?
A green Kawasaki motorcycle is parked on a carpet inside a large room.
Answer: motorcycle, park, room

Problem: What are the most important words?
A pair of ski's that are leaning against the wall.
Answer: pair, ski, wall

Problem: What are the most important words?
the building with yellow dome on the top is a city
Answer:
city, dome, top