specify vs flesh out

specify and flesh out both are verbs.

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

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

specify: be specific about
flesh out: add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing

Other hypernyms of specify include dilate, elaborate, enlarge, expand, expatiate, exposit, expound, lucubrate.

specify (verb)	flesh out (verb)
design or destine	become round, plump, or shapely
define clearly	add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
select something or someone for a specific purpose	make fat or plump
be specific about
decide upon or fix definitely
specify as a condition or requirement in a contract or agreement; make an express demand or provision in an agreement
determine the essential quality of