Problem: What are the most important words?
mist and frost lingers in fields surrounding hill as the winter sun begins to rise .
Answer: begin, field, linger, rise, surround

Problem: What are the most important words?
moored boats and ships at marina in the town
Answer: boat, moor, town

Problem: What are the most important words?
A tourist looking at a map to find directions.
Answer:
direction, find, look