foundry vs manufacturing plant

foundry and manufacturing plant both are nouns.

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

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

foundry: factory where metal castings are produced
manufacturing plant: a plant consisting of one or more buildings with facilities for manufacturing

Other hypernyms of foundry include factory, manufactory, mill.

foundry (noun)	manufacturing plant (noun)
factory where metal castings are produced	a plant consisting of one or more buildings with facilities for manufacturing