decoding vs steganography

decoding and steganography both are nouns.

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

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

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

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

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