If needed
When required and if needed are semantically related. In some cases you can replace phrase "When required" with "If needed", this phrases are similar.
When required
If needed and when required are semantically related. Sometimes you can replace phrase "If needed" with "When required", this phrases are similar.
Mutual synonyms
Cite this Source
When required and If needed. (2017). Retrieved 2026, August 02, from https://thesaurus.plus/related/if_needed/when_required
If needed & When required. N.p., 2017. Web. 02 Aug. 2026. <https://thesaurus.plus/related/if_needed/when_required>.
When required or If needed. 2017. Accessed August 02, 2026. https://thesaurus.plus/related/if_needed/when_required.
Google Ngram Viewer shows how "if needed" and "when required" have occurred on timeline