Problem: What are the most important words?
a wind turbine on top of a block of flats
Answer: block, flat, top

Problem: What are the most important words?
head to westward cliffs where a man perches atop the rocks
Answer: cliff, head, perch

Problem: What are the most important words?
The bowl has a half a grapefruit and the plate has donut and the other half.
Answer:
grapefruit, half, plate