Problem: What are the most important words?
the sun glows vividly behind clouds in a red and orange sky
Answer: cloud, glow, sun

Problem: What are the most important words?
elephants use their trunks to smell for possible danger .
Answer: danger, elephant, smell, trunk, use

Problem: What are the most important words?
a helicopter leaves the ship which is anchored off the coast
Answer:
coast, helicopter, ship