factory
- works - mill - plant
‘factory’
A building where machines are used to make things is usually called a factory.
I work in a cheese factory.
He visited several factories which produce domestic electrical goods.
‘works’
A place where things are made or where an industrial process takes place can also be called a works. A works can consist of several buildings and may include outdoor equipment and machinery.
There used to be an iron works here.
After works you can use either a singular or plural form of a verb.
The sewage works was closed down.
Engineering works are planned for this district.
‘mill’
A building where a particular material is made is often called a mill.
He worked at a cotton mill.
‘plant’
A building where chemicals are produced is called a chemical plant.
There was an explosion at a chemical plant.
A power station can also be referred to as a plant.
They discussed the re-opening of the nuclear plant.