good turn vs favor

good turn and favor both are nouns.

Word	Noun	Adjective	Verb	Adverb
good turn	Yes	No	No	No
favor	Yes	No	Yes	No

As nouns, favor is a hypernym of good turn; that is, favor is a word with a broader meaning than good turn:

Other hypernyms of good turn include favour.

good turn (noun)	favor (noun)
a favor for someone	an act of gracious kindness
	souvenir consisting of a small gift given to a guest at a party
	an advantage to the benefit of someone or something
	an inclination to approve
	a feeling of favorable regard