expound vs expatiate

expound and expatiate both are verbs.

Word	Noun	Adjective	Verb	Adverb
expound	No	No	Yes	No
expatiate	No	No	Yes	No

As verbs, expound and expatiate are synonyms defined as:

expound and expatiate: add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing

Other synonyms of expound include dilate, elaborate, enlarge, expand, exposit, flesh out, lucubrate.

As verbs, expatiate is a hypernym of expound; that is, expatiate is a word with a broader meaning than expound:

expound: state
expatiate: add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing

Other hypernyms of expound include dilate, elaborate, enlarge, expand, exposit, expound, flesh out, lucubrate.

expound (verb)	expatiate (verb)
add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing	add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
state