radiotelephone vs radiotelephony

radiotelephone and radiotelephony both are nouns.

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

As nouns, radiotelephone and radiotelephony are synonyms defined as:

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

Other synonyms of radiotelephone include wireless telephone.

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