spent vs worn out

spent and worn out both are adjectives.

Word	Noun	Adjective	Verb	Adverb
spent	No	Yes	No	No
worn out	No	Yes	No	No

As adjectives, spent and worn out are synonyms defined as:

spent and worn out: drained of energy or effectiveness; extremely tired; completely exhausted

Other synonyms of spent include dog-tired, exhausted, fagged, fatigued, gone, played out, washed-out, worn-out.

spent (adjective)	worn out (adjective)
depleted of energy, force, or strength	drained of energy or effectiveness; extremely tired; completely exhausted
drained of energy or effectiveness; extremely tired; completely exhausted