code vs write in code

code is a noun but write in code is not a noun.

Word	Noun	Adjective	Verb	Adverb
code	Yes	No	Yes	No
write in code	No	No	Yes	No

As verbs, code and write in code are synonyms defined as:

Other synonyms of code include cipher, cypher, encipher, encrypt, inscribe.

code (noun)	write in code (noun)
a coding system used for transmitting messages requiring brevity or secrecy
a set of rules or principles or laws (especially written ones)
(computer science) the symbolic arrangement of data or instructions in a computer program or the set of such instructions
a series of letters, numbers or symbols assigned to something for the purpose of classification or identification

code (verb)	write in code (verb)
convert ordinary language into code	convert ordinary language into code
attach a code to