Occasion
Occasion noun - Someone or something responsible for a result.
Usage example: the missing money proved to be the occasion of much strife between the two brothers
Source and occasion are semantically related in thing topic. In some cases you can use "Source" instead a noun "Occasion", when it comes to topics like reason.
Source
Source noun - A point or place at which something is invented or provided.
How words are described
Both words in one sentence
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On one occasion, an attempt to harness them as an alternative fuel source backfired, and forced the school to evacuate.
Source: Fartillery - And it's not just in their interjections; on occasion the writing itself can be surprisingly informal for an RPG source book.
Source: Tabletop Game / 13th Age -
Abusive Parents: Straight from the source manga, Akira's mothers force him to steal stuff and, in one occasion, kidnap people.
Cite this Source
Source and Occasion. (2016). Retrieved 2026, July 20, from https://thesaurus.plus/related/occasion/source
Occasion & Source. N.p., 2016. Web. 20 Jul. 2026. <https://thesaurus.plus/related/occasion/source>.
Source or Occasion. 2016. Accessed July 20, 2026. https://thesaurus.plus/related/occasion/source.
Google Ngram Viewer shows how "occasion" and "source" have occurred on timeline