manufactory vs manufacturing plant

manufactory and manufacturing plant both are nouns.

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

As nouns, manufactory and manufacturing plant are synonyms defined as:

manufactory and manufacturing plant: a plant consisting of one or more buildings with facilities for manufacturing

Other synonyms of manufactory include factory, mill.

manufactory (noun)	manufacturing plant (noun)
a plant consisting of one or more buildings with facilities for manufacturing	a plant consisting of one or more buildings with facilities for manufacturing