steel mill vs manufactory

steel mill and manufactory both are nouns.

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

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

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

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

steel mill (noun)	manufactory (noun)
a factory where steel is made	a plant consisting of one or more buildings with facilities for manufacturing