Problem: What are the most important words?
woman hand casts a ballot as she votes for the local elections at a polling station
Answer: ballot, cast, hand, station, vote

Problem: What are the most important words?
an astronaut drifting in space is rescued by a space shuttle orbiting earth
Answer: astronaut, drift, earth, rescue, space

Problem: What are the most important words?
The young woman visiting the zoo is posing for a photo with a statue of a giraffe.
Answer:
giraffe, photo, pose, zoo