Problem: What are the most important words?
She smiles, takes in a savoring breath, then inspects the rest of the apartment.
Answer: breath, smile, take

Problem: What are the most important words?
Oil from a vehicle is being drained into an oil pan outside.
Answer: drain, oil, pan, vehicle

Problem: What are the most important words?
the main road of a city leading to person at sunset .
Answer:
city, lead, road, sunset