Problem: What are the most important words?
growing hops at the farm
Answer: farm, grow, hop

Problem: What are the most important words?
biological species leaves with flower and seeds in a mortar
Answer: flower, seed, specie

Problem: What are the most important words?
panning shot waterfalls in the jungles in rainy season the flowing water coming from the mountains
Answer:
mountain, pan, water, waterfall