adjective
A word that describes or modifies a noun or pronoun. In this case, 'smaller' is describing the size of something in comparison to something else.
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The smaller size of the new model makes it more convenient for traveling.
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I prefer smaller portions when eating out so I don't feel too full.
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I need a smaller bag to carry around all my stuff.
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His ego is so big that he can't see the smaller impact he has on others.