Problem: What are the most important words?
Large tiled shower area next to modern sink in bathroom.
Answer: area, bathroom, sink, tile

Problem: What are the most important words?
secondhand books on sale early in the morning at a car boot sale or market
Answer: book, market, sale

Problem: What are the most important words?
astronaut in outer space on the elements of this image furnished by spacecraft manufacturer
Answer:
astronaut, furnish, image