single out vs differentiate

single out and differentiate both are verbs.

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

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

Other hypernyms of single out include distinguish, secern, secernate, separate, severalise, severalize, tell, tell apart.

single out (verb)	differentiate (verb)
select from a group	become distinct and acquire a different character
treat differently on the basis of sex or race	become different during development
	evolve so as to lead to a new species or develop in a way most suited to the environment
	calculate a derivative; take the derivative
	mark as different
	be a distinctive feature, attribute, or trait; sometimes in a very positive sense