hold back vs hold out

hold back and hold out both are verbs.

Word	Noun	Adjective	Verb	Adverb
hold back	No	No	Yes	No
hold out	No	No	Yes	No

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

Other hyponyms of hold back include delay.

hold back (verb)	hold out (verb)
prevent the action or expression of	thrust or extend out
hold back, as of a danger or an enemy; check the expansion or influence of	stand up or offer resistance to somebody or something
hold back; keep from being perceived by others	continue to live and avoid dying
secure and keep for possible future use or application	last and be usable
wait before acting	wait uncompromisingly for something desirable
refrain from doing