rainbow

/ˈɹeɪnbəʊ/noun

A curved band of many colours that appears in the sky when sunlight passes through drops of rain.

Example sentences

“After the storm, a bright rainbow stretched over the valley.”
“The kids tried to name all seven colors of the rainbow.”

The idiom 'chasing rainbows' means pursuing something impossible. As a modifier it signals many colors or broad variety: a rainbow coalition.

Related words

sunshineThe light and warmth that come directly from the sun.lightningA sudden bright flash caused by a powerful electrical discharge inside a cloud, between clouds, or between a cloud and the ground.breezeA soft, mild movement of air.thunderThe deep rumbling or crashing noise that follows a lightning flash, produced when the heated air around the bolt expands suddenly.cloudA mass of tiny water drops floating together in the sky where it can be seen.stormA spell of severe weather with heavy rain, snow, or hail, often accompanied by thunder and lightning.