Problem: What are the most important words?
the sky is filled with smoke as flames inch closer to a group of houses
Answer: fill, flame, sky, smoke

Problem: What are the most important words?
A man shows how to iron a piece of cloth without having any wrinkles left.
Answer: cloth, iron, piece

Problem: What are the most important words?
a man admires a brown trout he caught
Answer:
admire, catch, trout