noun
A noun is a word that represents a person, place, thing, or idea. In this case, 'treasure house' is a noun because it represents a place where treasures are kept or stored.
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The museum is often referred to as a treasure house of priceless artifacts.
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My grandma's attic is like a treasure house filled with old family heirlooms.
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That thrift store is a treasure house for finding unique vintage clothing.
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Her mind was a treasure house of knowledge and wisdom.