noun
A word that represents a person, place, thing, or idea. 'Hug button' is a noun as it refers to a physical or virtual button that initiates a hug.
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The new device includes a hug button that sends a comforting embrace to your loved ones.
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I wish there was a hug button on my phone so I could send virtual hugs to my friends.
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I could really use a hug button right now to cheer me up.
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Her smile was like a hug button, instantly brightening up the room.