Defunct and Outworn

Defunct adjective - No longer existing.

Outworn and defunct are semantically related In some cases you can use "Outworn" instead an adjective "Defunct".

Outworn adjective - Having passed its time of use or usefulness.

Defunct and outworn are semantically related in outdated topic. Sometimes you can use "Defunct" instead an adjective "Outworn", if it concerns topics such as out of date.