Problem: What are the most important words?
biological species eating at the feeder with a nut in its beak .
Answer: eat, nut, specie

Problem: What are the most important words?
An elephant is eating grass in Kenya.
Answer: eat, elephant, grass

Problem: What are the most important words?
traffic is reduced to lane after a truck struck overpass bridges on the interstate .
Answer:
bridge, lane, reduce, traffic