Problem: What are the most important words?
waves roll in against a rocky coast under a cloudy blue sky in this seamlessly looping video footage
Answer: coast, loop, wave

Problem: What are the most important words?
politician ruled and country became the most important city
Answer: city, country, politician

Problem: What are the most important words?
a city overlooks the moored barges and narrow boats
Answer:
boat, moor, overlook