Problem: What are the most important words?
a herd of elephants with wet skins leaving from the waterhole at which they have been drinking
Answer: drink, herd, waterhole

Problem: What are the most important words?
crucifix in church on the stone wall
Answer: church, crucifix, wall

Problem: What are the most important words?
A dish of pasta with chicken, broccoli and cheese.
Answer:
broccoli, dish, pasta