wear down vs wear out

wear down and wear out both are verbs.

Word	Noun	Adjective	Verb	Adverb
wear down	No	No	Yes	No
wear out	No	No	Yes	No

As verbs, wear down and wear out are synonyms defined as:

wear down and wear out: exhaust or get tired through overuse or great strain or stress

Other synonyms of wear down include fag, fag out, fatigue, jade, outwear, tire, tire out, wear, wear upon, weary.

As verbs, wear down and wear out are synonyms defined as:

Other synonyms of wear down include wear, wear off, wear thin.

wear down (verb)	wear out (verb)
exhaust or get tired through overuse or great strain or stress	exhaust or get tired through overuse or great strain or stress
deteriorate through use or stress	deteriorate through use or stress
	go to pieces