Problem: What are the most important words?
A tabby cat lies on a shelf next to a computer and mouse.
Answer: cat, lie, mouse, shelf

Problem: What are the most important words?
Skiers unpacking their equipment in the parking lot of slopes.
Answer: lot, skier, slope

Problem: What are the most important words?
butterfly flies to a flower and collects nectar
Answer:
butterfly, flower, nectar