enlargement vs discussion

enlargement and discussion both are nouns.

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

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

enlargement: a discussion that provides additional information
discussion: an extended communication (often interactive) dealing with some particular topic

Other hypernyms of enlargement include discourse, treatment.

enlargement (noun)	discussion (noun)
the act of increasing (something) in size or volume or quantity or scope	an exchange of views on some topic
a photographic print that has been enlarged	an extended communication (often interactive) dealing with some particular topic
a discussion that provides additional information
the state of being enlarged