radiotelegraph vs radiotelegraphy

radiotelegraph and radiotelegraphy both are nouns.

Word	Noun	Adjective	Verb	Adverb
radiotelegraph	Yes	No	No	No
radiotelegraphy	Yes	No	No	No

As nouns, radiotelegraph and radiotelegraphy are synonyms defined as:

radiotelegraph and radiotelegraphy: the use of radio to send telegraphic messages (usually by Morse code)

Other synonyms of radiotelegraph include wireless telegraph, wireless telegraphy.

As nouns, radiotelegraph and radiotelegraphy are synonyms defined as:

radiotelegraph and radiotelegraphy: telegraphy that uses transmission by radio rather than by wire

Other synonyms of radiotelegraph include wireless telegraphy.

radiotelegraph (noun)	radiotelegraphy (noun)
the use of radio to send telegraphic messages (usually by Morse code)	the use of radio to send telegraphic messages (usually by Morse code)
telegraphy that uses transmission by radio rather than by wire	telegraphy that uses transmission by radio rather than by wire