turn tail vs flee

turn tail and flee both are verbs.

Word	Noun	Adjective	Verb	Adverb
turn tail	No	No	Yes	No
flee	No	No	Yes	No

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

Other hyponyms of turn tail include fly, take flight, skedaddle.

turn tail (verb)	flee (verb)
flee; take to one's heels; cut and run	run away quickly