Problem: What are the most important words?
best solar panels in tubes sitting on a roof
Answer: panel, roof, sit

Problem: What are the most important words?
footballer has strong words for football coach after he sent off soccer player for a challenge on football player
Answer: coach, footballer, player

Problem: What are the most important words?
An airplane parked next to a terminal ready for passengers to board.
Answer:
park, passenger, terminal