Necessary
Necessary adjective - Forcing one's compliance or participation by or as if by law.
Sustaining and necessary are semantically related. In some cases you can use "Sustaining" instead an adjective "Necessary".
Nearby Words: necessity, necessarily
Sustaining
Necessary and sustaining are semantically related. Sometimes you can use "Necessary" instead an adjective "Sustaining".
Mutual synonyms
Both words in one sentence
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They primarily deal in exploiting exoplanets for resources, but dabble in most anything else that is necessary for them to be self-sustaining during lengthy space missions.
Source: Video Game / SpaceChem
Cite this Source
Sustaining and Necessary. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/necessary/sustaining
Necessary & Sustaining. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/necessary/sustaining>.
Sustaining or Necessary. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/necessary/sustaining.
Google Ngram Viewer shows how "necessary" and "sustaining" have occurred on timeline