Problem: What are the most important words?
time lapse at dusk with clouds moving over the city and a full moon rising
Answer: city, cloud, lapse, moon, rise

Problem: What are the most important words?
serving punch at a holiday party is an easy way to keep the drinks flowing .
Answer: drink, party, way

Problem: What are the most important words?
earth from space showing continent .
Answer:
continent, earth, space