telegraphy vs telegraph

telegraphy and telegraph both are nouns.

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

As nouns, telegraphy and telegraph are synonyms defined as:

telegraphy and telegraph: apparatus used to communicate at a distance over a wire (usually in Morse code)

telegraphy (noun)	telegraph (noun)
apparatus used to communicate at a distance over a wire (usually in Morse code)	apparatus used to communicate at a distance over a wire (usually in Morse code)
communicating at a distance by electric transmission over wire

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