separator vs apparatus

separator and apparatus both are nouns.

Word	Noun	Adjective	Verb	Adverb
separator	Yes	No	No	No
apparatus	Yes	No	No	No

As nouns, apparatus is a hypernym of separator; that is, apparatus is a word with a broader meaning than separator:

separator: an apparatus that uses centrifugal force to separate particles from a suspension
apparatus: equipment designed to serve a specific function

Other hypernyms of separator include setup.

separator (noun)	apparatus (noun)
an apparatus that uses centrifugal force to separate particles from a suspension	equipment designed to serve a specific function
	(anatomy) a group of body parts that work together to perform a given function