single out vs redline

single out and redline both are verbs.

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

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

single out: treat differently on the basis of sex or race
redline: discriminate in selling or renting housing in certain areas of a neighborhood

Other hyponyms of single out include insulate, isolate, hive off, segregate, disadvantage, disfavor, disfavour.

single out (verb)	redline (verb)
select from a group	discriminate in selling or renting housing in certain areas of a neighborhood
treat differently on the basis of sex or race