Problem: What are the most important words?
An elephant standing next to a bail of hay.
Answer: bail, hay, stand

Problem: What are the most important words?
a city is in award category as the worlds largest covering square meters or acres .
Answer: category, city, world

Problem: What are the most important words?
Two double decker buses pulling up to a stop along the curb.
Answer:
bus, curb, pull, stop