Problem: What are the most important words?
tourist attraction is a fortification built by traders for trade in timber and gold
Answer: build, fortification, gold, timber, trade

Problem: What are the most important words?
president of politician during his visit lay flowers
Answer: flower, lie, politician, president

Problem: What are the most important words?
Airplane on the tarmac being pulled by a vehicle.
Answer:
airplane, tarmac, vehicle