noun
a word that represents a person, place, thing, or idea
preposition
a word that shows the relationship between a noun (or pronoun) and other words in a sentence
article
a word that is used to specify a noun as definite or indefinite
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There is nothing new under the sun, as all knowledge has been discovered before.
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I've tried every ice cream flavor under the sun, but I keep going back to vanilla.
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I've seen every movie under the sun, but nothing beats the classics.
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She searched high and low for the perfect dress, looking at every store under the sun.