outwear vs wear down

outwear and wear down both are verbs.

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

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

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

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

outwear (verb)	wear down (verb)
exhaust or get tired through overuse or great strain or stress	exhaust or get tired through overuse or great strain or stress
last longer than others	deteriorate through use or stress