radiophone vs cellphone

radiophone and cellphone both are nouns.

Word	Noun	Adjective	Verb	Adverb
radiophone	Yes	No	No	No
cellphone	Yes	No	No	No

As nouns, cellphone is a hyponym of radiophone; that is, cellphone is a word with a more specific, narrower meaning than radiophone:

radiophone: a telephone that communicates by radio waves rather than along cables
cellphone: a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver

Other hyponyms of radiophone include cell, cellular phone, cellular telephone, mobile phone.

radiophone (noun)	cellphone (noun)
a telephone that communicates by radio waves rather than along cables	a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver