Problem: What are the most important words?
astronaut is seen in spacecraft aboard satellite during mission to the orbiting laboratory .
Answer: astronaut, mission, spacecraft

Problem: What are the most important words?
window open to a bright blue sky filled with clouds
Answer: cloud, sky, window

Problem: What are the most important words?
several trees were uprooted along state and national highways due to rain and along with the heavy wind .
Answer:
rain, tree, uproot