Other forms: factories
A factory is a big building in which products are made, like Willie Wonka's fictional Chocolate Factory, which was famous for producing (among other sweets and treats) the one-of-a-kind Everlasting Gobstopper.
Early relatives of the word factory were in use as far back as the 1500s, long before the Industrial Revolution made the modern idea of a factory a reality. Of course, a big building with many different types of machinery inside it isn't the only definition of a factory. A successful pop group that scores several number one songs in a row could be called "a hit factory."