Problem: What are the most important words?
Hardworking farmer and oxen plowing his fields on a hot summer day.
Answer: farmer, field, oxen

Problem: What are the most important words?
A fisherman tries to catch sharks on his small rowboat
Answer: catch, fisherman, shark

Problem: What are the most important words?
blue sky with a cross and the glow of white light
Answer:
cross, light, sky