Problem: What are the most important words?
punching hand with a clenched fist aimed directly at the viewer isolated on grey
Answer: aim, clench, fist, hand, isolate

Problem: What are the most important words?
path through a field of ripening wheat just before harvest
Answer: field, harvest, ripen, wheat

Problem: What are the most important words?
salesman gives a keys a happy customer after successful deal of buying car
Answer:
buy, car, deal, salesman