Bygone
Bygone adjective - No longer existing.
Usage example: elderly people reminiscing about bygone fashions
Extinct
Extinct adjective - No longer existing.
Usage example: a few overgrown ruins are all that remain of that once mighty but now extinct civilization
Bygone is a synonym for extinct in dead topic. You can use "Bygone" instead an adjective "Extinct", if it concerns topics such as vanished. popular alternative
Nearby Word: extinction
Mutual synonyms
Cite this Source
Extinct and Bygone. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/bygone/extinct
Bygone & Extinct. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/bygone/extinct>.
Extinct or Bygone. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/bygone/extinct.
Google Ngram Viewer shows how "bygone" and "extinct" have occurred on timeline