cipher vs common person

cipher and common person both are nouns.

Word	Noun	Adjective	Verb	Adverb
cipher	Yes	No	Yes	No
common person	Yes	No	No	No

As nouns, common person is a hypernym of cipher; that is, common person is a word with a broader meaning than cipher:

Other hypernyms of cipher include common man, commoner.

cipher (noun)	common person (noun)
a secret method of writing	a person who holds no title
a message written in a secret code
a person of no influence
a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential
a mathematical element that when added to another number yields the same number

cipher (verb)	common person (verb)
make a mathematical calculation or computation
convert ordinary language into code