steelworks vs mill

steelworks and mill both are nouns.

Word	Noun	Adjective	Verb	Adverb
steelworks	Yes	No	No	No
mill	Yes	No	Yes	No

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

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

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

steelworks (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

steelworks (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