Problem: What are the most important words?
antiques for sale in shop
Answer: antique, sale, shop

Problem: What are the most important words?
the cog is grazing on the grass, he has big horns
Answer: grass, graze, horn

Problem: What are the most important words?
colorful image of couple laughing in the snow for their engagement session wrapped in a blanket
Answer:
blanket, session, snow, wrap