noun
A noun is a word that represents a person, place, thing, or idea. In this case, 'atom smashing' is a noun because it represents a process or action of breaking apart atoms.
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Scientists have made significant advancements in the field of particle physics through atom smashing experiments.
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Have you heard about that crazy atom smashing stuff scientists are doing in the lab?
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Dude, the atom smashing experiments they're doing in the lab are blowing my mind.
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Her words felt like atom smashing, breaking down all my defenses and leaving me vulnerable.