cypher vs pip-squeak

cypher and pip-squeak both are nouns.

Word	Noun	Adjective	Verb	Adverb
cypher	Yes	No	Yes	No
pip-squeak	Yes	No	No	No

As nouns, pip-squeak is a hyponym of cypher; that is, pip-squeak is a word with a more specific, narrower meaning than cypher:

Other hyponyms of cypher include small fry, squirt, jackanapes, lightweight, whippersnapper.

cypher (noun)	pip-squeak (noun)
a secret method of writing	someone who is small and insignificant
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

cypher (verb)	pip-squeak (verb)
make a mathematical calculation or computation
convert ordinary language into code