deliberation vs discussion

deliberation and discussion both are nouns.

Word	Noun	Adjective	Verb	Adverb
deliberation	Yes	No	No	No
discussion	Yes	No	No	No

As nouns, discussion is a hypernym of deliberation; that is, discussion is a word with a broader meaning than deliberation:

Other hypernyms of deliberation include give-and-take, word.

deliberation (noun)	discussion (noun)
the trait of thoughtfulness in action or decision	an exchange of views on some topic
a rate demonstrating an absence of haste or hurry	an extended communication (often interactive) dealing with some particular topic
planning something carefully and intentionally
careful consideration
(usually plural) discussion of all sides of a question