flesh out vs clarify

flesh out and clarify both are verbs.

Word	Noun	Adjective	Verb	Adverb
flesh out	No	No	Yes	No
clarify	No	No	Yes	No

As verbs, clarify is a hypernym of flesh out; that is, clarify is a word with a broader meaning than flesh out:

flesh out: add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
clarify: make clear and (more) comprehensible

Other hypernyms of flesh out include clear up, elucidate.

flesh out (verb)	clarify (verb)
become round, plump, or shapely	make clear by removing impurities or solids, as by heating
add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing	make clear and (more) comprehensible
make fat or plump