Problem: What are the most important words?
a firefighter uses a hose to douse the flames of disaster .
Answer: douse, firefighter, flame, hose, use

Problem: What are the most important words?
high waves smash onto rocks along the coast
Answer: coast, smash, wave

Problem: What are the most important words?
people in old boat on the lake in spring time .
Answer:
boat, lake, time