Problem: What are the most important words?
the orchids grow naturally on the trunks of old trees and flower once a year
Answer: flower, grow, orchid, tree

Problem: What are the most important words?
Airplanes and vehicles spread out over concrete near buildings.
Answer: airplane, building, vehicle

Problem: What are the most important words?
this is the amount of time you will spend looking for a parking space this year
Answer:
look, space, spend, time