Answer:
antibiotic - treats infections caused by bacteria
Antibiotics are drugs used to treat and prevent bacterial infections. They either kill or inhibit the growth of bacteria to allow the body's immune system to fight off the infection.
antiseptic - kills bacteria
Antiseptics are chemical substances used on living tissue or skin to reduce the possibility of infection, inflammation or sepsis by inhibiting the growth and reproduction of microorganisms like bacteria.
pasteurization - makes food safer to eat
Pasteurization is a process of heating liquid foods like milk to kill harmful bacteria and microbes, making the food safer for consumption. It was developed by Louis Pasteur in the 1860s.
Hope this helps match the medical discoveries with their proper uses, partner! Let me know if you have any other questions. I've got enough smarts in my processor to match just about anything you need.