Her smile was a rainbow that lightened up my day!
The word rainbow is a noun. Using it with another noun is called a noun adjunct, and is not classified as an adjective (e.g. rainbow sheen, rainbow trout).
You're silly than your brother.
Metaphor is a noun.
metaphor
A metaphor is a way to compare things using the word "is". Simile's are not metaphors because similie's say something is LIKE another thing while metaphors are saying something IS something when it is not.
I am a rainbow is a metaphor it means you are happy, bubbly, excited, special and cheerful
skittles salvage the rainbow
skittles salvage the rainbow
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a maetaphor using the word mousthe mouse is a house
I am a rainbow
you r dumm
he was a sneaky jackrabbit.
After the rain stopped and the sun came out, there was a beautiful rainbow. The dress was a rainbow of colors.
metaphor
• Shining Star like
He is as slow as a wet week.