works vs factory

works and factory both are nouns.

Word	Noun	Adjective	Verb	Adverb
works	Yes	No	No	No
factory	Yes	No	No	No

As nouns, factory is a hyponym of works; that is, factory is a word with a more specific, narrower meaning than works:

works: buildings for carrying on industrial labor
factory: a plant consisting of one or more buildings with facilities for manufacturing

works (noun)	factory (noun)
performance of moral or religious acts	a plant consisting of one or more buildings with facilities for manufacturing
the internal mechanism of a device
buildings for carrying on industrial labor
everything available; usually preceded by `the'