Problem: What are the most important words?
Pieces of broccoli and cheese arranged on bread.
Answer: broccoli, cheese, piece

Problem: What are the most important words?
reflection of mountain in a lake
Answer: lake, mountain, reflection

Problem: What are the most important words?
A man playing scrabble with carrots, celery, onions, limes, apples and cauliflower, with an alien.
Answer:
carrot, cauliflower, celery, lime, onion