Problem: What are the most important words?
A power boat is moored at a seawall.
Answer: boat, moor, seawall

Problem: What are the most important words?
free art print of oil painting of the beautiful flowers .
Answer: flower, painting, print

Problem: What are the most important words?
A large sheep is being sheered by a boy as a man comes to help.
Answer:
help, sheep, sheer