Problem: What are the most important words?
A zebra eats short grass inside its enclosure
Answer: enclosure, grass, zebra

Problem: What are the most important words?
a stag stands amongst red deer as they are shrouded in mist during sunrise
Answer: deer, stand, sunrise

Problem: What are the most important words?
White microwave oven installed beneath cabinets in kitchens.
Answer:
cabinet, instal, microwave, oven