Problem: What are the most important words?
A woman strides across the corner of a tennis court with her racket in the air.
Answer: air, corner, court, racket, stride

Problem: What are the most important words?
species a group of organisms that can interbreed in nature and produce fertile offspring
Answer: interbreed, nature, offspring, organism, produce

Problem: What are the most important words?
a grill with charcoal and flames
Answer:
charcoal, flame, grill