discriminate vs single out

discriminate is an adjective but single out is not an adjective.

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

As verbs, discriminate and single out are synonyms defined as:

discriminate and single out: treat differently on the basis of sex or race

Other synonyms of discriminate include separate.

discriminate (adjective)	single out (adjective)
marked by the ability to see or make fine distinctions

discriminate (verb)	single out (verb)
recognize or perceive the difference	select from a group
distinguish	treat differently on the basis of sex or race
treat differently on the basis of sex or race