adjective
describing the color of something as brown
adverb
modifying the adjective 'brown' to show the intensity of the color
preposition
connecting the adjective 'brown' to the noun 'berry'
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After spending the entire summer working in the fields, his skin was as brown as a berry.
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She just got back from her beach vacation and now she's as brown as a berry.
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I can't believe how tan she got, she's as brown as a berry now.
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His knowledge on the subject was as brown as a berry, showing how deeply he understood it.