Problem: What are the most important words?
A kid who is angry is staring without blinking his eyes at all.
Answer: blink, eye, stare

Problem: What are the most important words?
the only planet to have liquid water at the surface .
Answer: planet, surface, water

Problem: What are the most important words?
some urinals and toilet stalls in a restroom
Answer:
restroom, stall, toilet