Problem: What are the most important words?
man snoring with his wife covering ears with pillow on the bed
Answer: cover, ear, snore

Problem: What are the most important words?
A herd of elephants and their calves walking single file
Answer: calf, elephant, herd

Problem: What are the most important words?
snow scene with upturned boats on the coast in winter .
Answer:
boat, coast, winter