noun
a word that represents a person, place, thing, or idea. In this case, 'storm clouds' is a noun as it refers to a collection of clouds that typically bring inclement weather.
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As the storm clouds gathered in the sky, the meteorologists warned of potential severe weather.
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I knew it was going to rain when I saw those storm clouds rolling in.
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When we saw the storm clouds, we knew we were in for a real doozy of a storm.
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The dark storm clouds of uncertainty loomed over their relationship, signaling trouble ahead.