Problem: What are the most important words?
A cat is resting on top of a refrigerator.
Answer: cat, refrigerator, rest

Problem: What are the most important words?
adding wallpaper to the ceiling adds another dimension to your space .
Answer: add, ceiling, space

Problem: What are the most important words?
long high bank of shingle on the coast protects the brackish low marsh from the sea
Answer:
coast, protect, sea