tell vs single out

tell and single out both are verbs.

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

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

tell (verb)	single out (verb)
discern or comprehend	select from a group
mark as different	treat differently on the basis of sex or race
let something be known
narrate or give a detailed account of
give instructions to or direct somebody to do something with authority
give evidence
express in words
inform positively and with certainty and confidence