mobile phone vs cellphone

mobile phone and cellphone both are nouns.

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

As nouns, mobile phone and cellphone are synonyms defined as:

mobile phone and cellphone: a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver

Other synonyms of mobile phone include cell, cellular phone, cellular telephone.

mobile phone (noun)	cellphone (noun)
a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver	a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver