encoding vs steganography

encoding and steganography both are nouns.

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

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

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

encoding (noun)	steganography (noun)
the activity of converting data or information into code	act of writing in code or cipher