coding vs secret writing

coding and secret writing both are nouns.

Word	Noun	Adjective	Verb	Adverb
coding	Yes	No	No	No
secret writing	Yes	No	No	No

As nouns, coding and secret writing are synonyms defined as:

Other synonyms of coding include cryptography, steganography.

coding (noun)	secret writing (noun)
act of writing in code or cipher	act of writing in code or cipher
	a piece of writing in code or cipher