Problem: What are the most important words?
Large pizza covered in pepperoni, olives, peppers, onion, and mushrooms.
Answer: mushroom, olive, onion, pepperoni

Problem: What are the most important words?
A train coming to a stop on the tracks out side.
Answer: come, side, train

Problem: What are the most important words?
man under rain looking forward at the sky
Answer:
look, rain, sky