noun
a specific action or process
adjective
describing word that modifies a noun
adverb
word that modifies a verb, adjective, or other adverb
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The activity scheduled for tomorrow is a team-building exercise.
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Let's plan a fun activity for the weekend, like going to the beach.
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I'm not really into that activity, it's kind of boring.
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His mind was a flurry of activity as he tried to come up with a solution.