Problem: What are the most important words?
an extreme example of a large tree totally engulfing a stone chamber with its roots .
Answer: engulf, root, tree

Problem: What are the most important words?
flock of goats and sheep are coming down from a huge rock
Answer: come, flock, sheep

Problem: What are the most important words?
Three sheep are grazing on grass by trees.
Answer:
grass, graze, sheep, tree