single out vs disfavour

single out is not a noun while disfavour is a noun.

Word	Noun	Adjective	Verb	Adverb
single out	No	No	Yes	No
disfavour	Yes	No	Yes	No

As verbs, disfavour is a hyponym of single out; that is, disfavour is a word with a more specific, narrower meaning than single out:

Other hyponyms of single out include insulate, isolate, hive off, segregate, redline, disadvantage, disfavor.

single out (noun)	disfavour (noun)
	an inclination to withhold approval from some person or group
	the state of being out of favor

single out (verb)	disfavour (verb)
select from a group	put at a disadvantage; hinder, harm
treat differently on the basis of sex or race