noun
A word that represents a person, place, thing, or idea. In this case, 'grandfather' is a noun as it refers to a person's male parent.
article
A word that specifies a noun. In this case, 'the' is an article that specifies 'grandfather paradox'.
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The grandfather paradox is a famous thought experiment in the field of theoretical physics.
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Have you ever heard of the grandfather paradox? It's pretty mind-bending.
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Dude, the whole grandfather paradox thing messes with my head.
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The concept of the grandfather paradox is like a never-ending loop of cause and effect.