Problem: What are the most important words?
breakfast is the best meal of the day
Answer: breakfast, day, meal

Problem: What are the most important words?
Several different types of pendulum clocks mounted in two rows on a wall.
Answer: mount, row, wall

Problem: What are the most important words?
hd time lapse of morning in the hill full with beautiful cloud on the mountain and green forest
Answer:
forest, morning, mountain