Nouns

(n)zero, 0, nought, cipher, cyphera mathematical element that when added to another number yields the same number
(n)nothing, nil, nix, nada, null, aught, cipher, cypher, goose egg, naught, zero, zilch, zip, zippoa quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential“it looked like nothing I had ever seen before”, “reduced to nil all the work we had done”, “we racked up a pathetic goose egg”, “it was all for naught”, “I didn't hear zilch about it”
(n)cipher, cypher, nobody, nonentitya person of no influence
(n)cipher, cypher, cryptograph, secret codea secret method of writing
(n)cipher, cyphera message written in a secret code

Verbs

(v)code, encipher, cipher, cypher, encrypt, inscribe, write in codeconvert ordinary language into code“We should encode the message for security reasons”
(v)calculate, cipher, cypher, compute, work out, reckon, figuremake a mathematical calculation or computation