mobile phone vs radiophone

mobile phone and radiophone both are nouns.

Word	Noun	Adjective	Verb	Adverb
mobile phone	Yes	No	No	No
radiophone	Yes	No	No	No

As nouns, radiophone is a hypernym of mobile phone; that is, radiophone is a word with a broader meaning than mobile phone:

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

Other hypernyms of mobile phone include radiotelephone, wireless telephone.

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