electrograph vs apparatus

electrograph and apparatus both are nouns.

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

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

Other hypernyms of electrograph include setup.

electrograph (noun)	apparatus (noun)
electrical device used for etching by electrolytic means	equipment designed to serve a specific function
an apparatus for the electrical transmission of pictures	(anatomy) a group of body parts that work together to perform a given function