"Industry" itself can be a noun (referring to a specific type of work or a manufacturing process) or an adjective (meaning diligent and hardworking). "Industrious" is simply an adjective form of "industry" that emphasizes the hard-working quality.
"Industry" itself can be a noun (referring to a specific type of work or a manufacturing process) or an adjective (meaning diligent and hardworking). "Industrious" is simply an adjective form of "industry" that emphasizes the hard-working quality.