Problem: What are the most important words?
Bicyclists racing in a marathon with spectators viewing.
Answer: bicyclist, marathon, race, spectator, view

Problem: What are the most important words?
a couple of mallard ducks resting in tall grass at sundown
Answer: couple, grass, rest

Problem: What are the most important words?
tourist attraction featuring religious elements and a temple or place of worship
Answer:
attraction, element, feature, place, worship