noun
A word that represents a person, place, thing, or idea. In this case, 'secret' is also a noun as it refers to something that is kept hidden or unknown.
adjective
A word that describes or modifies a noun. In this case, 'secret' is an adjective as it describes the type of sauce.
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The company's success can be attributed to their secret sauce, a proprietary blend of ingredients that sets them apart from competitors.
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The secret sauce to her amazing chocolate chip cookies is a dash of cinnamon.
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If you want to impress your friends at the barbecue, you gotta have your own secret sauce for the ribs.
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His charisma and charm are like his secret sauce, making him stand out in any social situation.