Problem: What are the most important words?
time lapse of white clouds over a pond with trees
Answer: cloud, pond, tree

Problem: What are the most important words?
a stethoscope checking the heartbeat of a red heart .
Answer: check, heart, stethoscope

Problem: What are the most important words?
camera rises up stalks of corn to reveal a rising sun
Answer:
corn, rise, stalk, sun