steel factory vs mill

steel factory and mill both are nouns.

Word	Noun	Adjective	Verb	Adverb
steel factory	Yes	No	No	No
mill	Yes	No	Yes	No

As nouns, mill is a hypernym of steel factory; that is, mill is a word with a broader meaning than steel factory:

steel factory: a factory where steel is made
mill: a plant consisting of one or more buildings with facilities for manufacturing

Other hypernyms of steel factory include factory, manufactory, manufacturing plant.

steel factory (noun)	mill (noun)
a factory where steel is made	the act of grinding to a powder or dust
	machinery that processes materials by grinding or crushing
	a plant consisting of one or more buildings with facilities for manufacturing

steel factory (verb)	mill (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