mill vs shop floor

mill and shop floor both are nouns.

Word	Noun	Adjective	Verb	Adverb
mill	Yes	No	Yes	No
shop floor	Yes	No	No	No

mill (noun)	shop floor (noun)
the act of grinding to a powder or dust	workplace consisting of the part of a factory housing the machines
machinery that processes materials by grinding or crushing
a plant consisting of one or more buildings with facilities for manufacturing

mill (verb)	shop floor (verb)
grind with a mill
produce a ridge around the edge of
roll out (metal) with a rolling machine
move about in a confused manner