Problem: What are the most important words?
student writes a formula on the blackboard
Answer: blackboard, formula, student, write

Problem: What are the most important words?
A bathroom has a red circular rug by the toilet.
Answer: bathroom, rug, toilet

Problem: What are the most important words?
An Optometrist checks a man's vision before the man tries on his new glasses.
Answer:
check, glass, vision