Problem: What are the most important words?
Three girls use automatic whipper to stir a substance in a bowl.
Answer: bowl, stir, substance

Problem: What are the most important words?
A cat drinking out of the faucet of a sink.
Answer: cat, drink, faucet, sink

Problem: What are the most important words?
a lone tree in the fog with a ripe grain field
Answer:
field, fog, tree