Problem: What are the most important words?
A group of old friends reuniting for New Years after not seeing each other for 5 years.
Answer: friend, reunite, year

Problem: What are the most important words?
passenger high speed train moving under the blue sky and white clouds .
Answer: move, sky, train

Problem: What are the most important words?
mother and daughter collects a bouquet of autumn leaves in the park against the sunlight
Answer:
bouquet, collect, daughter, leave, park