Problem: What are the most important words?
a beautiful rainbow appears through puffy clouds on a blue sky after the rain .
Answer: rain, rainbow, sky

Problem: What are the most important words?
biological species perched on an old tree in the midst of the cloud forest
Answer: forest, perch, tree

Problem: What are the most important words?
blooming peony with red flowers in the garden
Answer:
bloom, garden, peony