Problem: What are the most important words?
The cattle are grazing in a big ground of green grass.
Answer: cattle, graze, ground

Problem: What are the most important words?
soccer player acknowledges person as he leaves the pitch after their match
Answer: leave, match, pitch, player

Problem: What are the most important words?
A group of tourists are feeding a giraffe in a zoo.
Answer:
giraffe, tourist, zoo