expatiation vs enlargement

expatiation and enlargement both are nouns.

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

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

expatiation: a discussion (spoken or written) that enlarges on a topic or theme at length or in detail
enlargement: a discussion that provides additional information

Other hypernyms of expatiation include elaboration, expansion.

expatiation (noun)	enlargement (noun)
a discussion (spoken or written) that enlarges on a topic or theme at length or in detail	the act of increasing (something) in size or volume or quantity or scope
	a photographic print that has been enlarged
	a discussion that provides additional information
	the state of being enlarged