Industrious = hard-working, diligent  , ( noun)- industry.

• His success was due to industry and thrift.
• Zakaria is extremely competent and industrious.
• He is an industrious and willing worker.

Industrial = relating to industry.

• The industrial area of south Mumbai is over-crowded.
• An industrial dispute( = one between workers and management).
• There are thousands of industrial uses for plastic.
• The city dwellers are forced to suffer a lot of industrial pollution.
• Banks should give thrust to the industrial growth of the country.
• (noun) industry = concerned with the processing of raw materials and manufacture of goods in factories.
• American industry is making increased use of computers to control production.