telegraph vs apparatus

telegraph and apparatus both are nouns.

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

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

telegraph: 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 telegraph include setup.

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

telegraph (verb)	apparatus (verb)
send cables, wires, or telegrams