single out vs discriminate

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

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

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

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

Other synonyms of single out include separate.

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

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