nuclear reactor vs setup

nuclear reactor and setup both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuclear reactor	Yes	No	No	No
setup	Yes	No	No	No

As nouns, setup is a hypernym of nuclear reactor; that is, setup is a word with a broader meaning than nuclear reactor:

nuclear reactor: (physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements
setup: equipment designed to serve a specific function

Other hypernyms of nuclear reactor include apparatus.

nuclear reactor (noun)	setup (noun)
(physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements	an act that incriminates someone on a false charge
	equipment designed to serve a specific function
	the way something is organized or arranged