corn (BrE), flour, grain
water (usually watermill)

operate
convert, restore (both esp. BrE)
The mill has been converted into apartments.
We were living in a converted watermill.

power
The river was harnessed to power the mill.

grind sth
The mill can be seen grinding wheat.

stone (usually millstone), wheel

cotton, feed, jute, lumber (esp. AmE), paper, pulp, steel, sugar, textile, woollen/woolen

operate, own, run
work in

produce sth

town
a northern mill town

buildings
hand, worker
owner