cellphone vs smartphone

cellphone and smartphone both are nouns.

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

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

cellphone: a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver
smartphone: a mobile phone with more advanced computing capability and connectivity than basic feature phones

Other hyponyms of cellphone include smart phone.

cellphone (noun)	smartphone (noun)
a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver	a mobile phone with more advanced computing capability and connectivity than basic feature phones