telegraphy vs apparatus

telegraphy and apparatus both are nouns.

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

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

telegraphy: apparatus used to communicate at a distance over a wire (usually in Morse code)
apparatus: equipment designed to serve a specific function

Other hypernyms of telegraphy include setup.

telegraphy (noun)	apparatus (noun)
apparatus used to communicate at a distance over a wire (usually in Morse code)	equipment designed to serve a specific function
communicating at a distance by electric transmission over wire	(anatomy) a group of body parts that work together to perform a given function