fact vs detail

fact and detail both are nouns.

Word	Noun	Adjective	Verb	Adverb
fact	Yes	No	No	No
detail	Yes	No	Yes	No

As nouns, detail is a hyponym of fact; that is, detail is a word with a more specific, narrower meaning than fact:

fact: a piece of information about circumstances that exist or events that have occurred
detail: an isolated fact that is considered separately from the whole

Other hyponyms of fact include case, item, point, particular, specific, general, matter of fact, observation, reason, score, truth.

fact (noun)	detail (noun)
a piece of information about circumstances that exist or events that have occurred	an isolated fact that is considered separately from the whole
a concept whose truth can be proved	extended treatment of particulars
a statement or assertion of verified information about something that is the case or has happened	a temporary military unit
an event known to have happened or something known to have existed	a crew of workers selected for a particular task
	a small part that can be considered separately from the whole

fact (verb)	detail (verb)
	assign to a specific task
	provide details for