decoding vs coding

decoding and coding both are nouns.

Word	Noun	Adjective	Verb	Adverb
decoding	Yes	No	No	No
coding	Yes	No	No	No

As nouns, coding is a hypernym of decoding; that is, coding is a word with a broader meaning than decoding:

decoding: the activity of making clear or converting from code into plain text
coding: act of writing in code or cipher

Other hypernyms of decoding include cryptography, secret writing, steganography.

decoding (noun)	coding (noun)
the activity of making clear or converting from code into plain text	act of writing in code or cipher