noun
A noun is a word that represents a person, place, thing, or idea. In this case, 'test flight' is a noun because it represents a specific type of flight used for testing purposes.
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The aerospace company conducted a test flight to evaluate the performance of their new aircraft.
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The pilot took the new plane for a test flight to see how it handles.
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They decided to take the new drone for a spin in a test flight.
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Embarking on a new project is like taking a test flight into uncharted territory.