run away vs flee

run away and flee both are verbs.

Word	Noun	Adjective	Verb	Adverb
run away	No	No	Yes	No
flee	No	No	Yes	No

As verbs, flee is a hyponym of run away; that is, flee is a word with a more specific, narrower meaning than run away:

Other hyponyms of run away include fly, take flight, skedaddle.

run away (verb)	flee (verb)
flee; take to one's heels; cut and run	run away quickly
escape from the control of