radiotelegraphy vs wireless

radiotelegraphy and wireless both are nouns.

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

As nouns, wireless is a hypernym of radiotelegraphy; that is, wireless is a word with a broader meaning than radiotelegraphy:

radiotelegraphy: the use of radio to send telegraphic messages (usually by Morse code)
wireless: a communication system based on broadcasting electromagnetic waves

Other hypernyms of radiotelegraphy include radio.

As nouns, wireless is a hypernym of radiotelegraphy; that is, wireless is a word with a broader meaning than radiotelegraphy:

radiotelegraphy: telegraphy that uses transmission by radio rather than by wire
wireless: transmission by radio waves

radiotelegraphy (noun)	wireless (noun)
the use of radio to send telegraphic messages (usually by Morse code)	a communication system based on broadcasting electromagnetic waves
telegraphy that uses transmission by radio rather than by wire	an electronic receiver that detects and demodulates and amplifies transmitted signals
	transmission by radio waves
	medium for communication

radiotelegraphy (adjective)	wireless (adjective)
	having no wires