radiotelephony vs radiotelephone

radiotelephony and radiotelephone both are nouns.

Word	Noun	Adjective	Verb	Adverb
radiotelephony	Yes	No	No	No
radiotelephone	Yes	No	No	No

As nouns, radiotelephony and radiotelephone are synonyms defined as:

radiotelephony and radiotelephone: telephony that uses transmission by radio rather than by wire

Other synonyms of radiotelephony include wireless telephone.

radiotelephony (noun)	radiotelephone (noun)
telephony that uses transmission by radio rather than by wire	a telephone that communicates by radio waves rather than along cables
	telephony that uses transmission by radio rather than by wire