Her smile was a rainbow that lightened up my day!
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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.