Problem: What are the most important words?
Planes on a wet tarmac unloading at arrival gates.
Answer: gate, plane, unload

Problem: What are the most important words?
a giraffe moving its mouth at a zoo
Answer: giraffe, mouth, zoo

Problem: What are the most important words?
mystic light of the sun breaking through the mist on a winter day
Answer:
break, day, mist