beeper vs pager

beeper and pager both are nouns.

Word	Noun	Adjective	Verb	Adverb
beeper	Yes	No	No	No
pager	Yes	No	No	No

As nouns, beeper and pager are synonyms defined as:

beeper and pager: an electronic device that generates a series of beeps when the person carrying it is being paged

beeper (noun)	pager (noun)
an electronic device that generates a series of beeps when the person carrying it is being paged	an electronic device that generates a series of beeps when the person carrying it is being paged