Irreplaceable
Irreplaceable adjective - Impossible to replace.
Necessary and irreplaceable are semantically related. In some cases you can use "Necessary" instead an adjective "Irreplaceable".
Necessary
Necessary adjective - Forcing one's compliance or participation by or as if by law.
Irreplaceable and necessary are semantically related. Sometimes you can use "Irreplaceable" instead an adjective "Necessary".
Nearby Words: necessity, necessarily
Mutual synonyms
Both words in one sentence
- Several issues establish both Nodwick and Piffany as irreplaceable to saving the world, but ultimately it's because they're necessary to enable Yeagar to be the real hero of the story.
Source: Comic Strip / Nodwick -
However, the body itself is not really important, the important things are the progenoid glands, that generate and store the geneseed necessary to create new Space Marines, and the expensive and in some cases outright irreplaceable weapons and armor.
Source: Due to the Dead
Cite this Source
Necessary and Irreplaceable. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/irreplaceable/necessary
Irreplaceable & Necessary. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/irreplaceable/necessary>.
Necessary or Irreplaceable. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/irreplaceable/necessary.
Google Ngram Viewer shows how "irreplaceable" and "necessary" have occurred on timeline