single out vs select

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

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

As verbs, select is a hypernym of single out; that is, select is a word with a broader meaning than single out:

Other hypernyms of single out include choose, pick out, take.

single out (adjective)	select (adjective)
	selected or chosen for special qualifications
	of superior grade

single out (verb)	select (verb)
select from a group	pick out, select, or choose from a number of alternatives
treat differently on the basis of sex or race