turn tail vs skedaddle

turn tail is not a noun while skedaddle is a noun.

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

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

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

turn tail (noun)	skedaddle (noun)
	a hasty flight

turn tail (verb)	skedaddle (verb)
flee; take to one's heels; cut and run	run away, as if in a panic