noun
a word that functions as the name of something, in this case, 'day'
adjective
a word that describes or modifies a noun, in this case, 'five'
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It is recommended to consume at least five servings of fruits and vegetables a day for a balanced diet.
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Don't forget to get your five a day in for a healthy lifestyle!
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Make sure you get in your five a day to keep your body happy!
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Just like exercise, getting your five a day is a workout for your immune system.