Problem: What are the most important words?
A zebra grazes on grass along with some antelope.
Answer: antelope, grass, zebra

Problem: What are the most important words?
A fire hydrant that is covered in black trash bags and duct tape.
Answer: bag, hydrant, tape

Problem: What are the most important words?
shots of the space shuttle endeavour flying over the city .
Answer:
city, fly, shot