What part of speech is industry?

Answer 1

The word "industry" can function as a noun. In this context, it refers to a particular form of economic activity, such as manufacturing or technology. As a noun, "industry" can also refer to diligence and hard work, as in "She showed great industry in completing her tasks."

Answer 2

It's a noun or a mass noun, in the sense of "the manufacturing industry" and a mass noun in the sense of "the kitchen became a hive of industry."