steel plant vs manufactory

steel plant and manufactory both are nouns.

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

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

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

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

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