good turn vs favour

good turn and favour both are nouns.

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

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

Other hypernyms of good turn include favor.

good turn (noun)	favour (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