Extinction
Extinction noun - The state or fact of being rendered nonexistent, physically unsound, or useless.
Unknown and extinction are semantically related. In some cases you can use "Unknown" instead a noun "Extinction".
Nearby Word: extinct
Unknown
Unknown noun - An unknown and unexplored region.
Extinction and unknown are semantically related. Sometimes you can use "Extinction" instead a noun "Unknown".
Nearby Words: unknowable, unknowing
Both words in one sentence
- Fox and his unknown associates are Harry, Hermione, and Luna who've been sent back in time to prevent the extinction of the Fae and kill Voldemort.
Source: Entertainingly Wrong - Unlike the K-Pg extinction, the P-Tr's cause is actually still unknown.
Source: Useful Notes / Dinosaurs - However, the epilogue shows one of Liara's time capsules (which she mentioned compiling earlier in the game) being discovered and explaining to an unknown species the cycle of extinction, the Reapers, the Crucible, and the story of Shepard's war.
Source: Recursive Precursors
Cite this Source
Unknown and Extinction. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/extinction/unknown
Extinction & Unknown. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/extinction/unknown>.
Unknown or Extinction. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/extinction/unknown.
Google Ngram Viewer shows how "extinction" and "unknown" have occurred on timeline