factory vs manufacturing plant

factory and manufacturing plant both are nouns.

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

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

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

Other synonyms of factory include manufactory, mill.

factory (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