Conjecture
Conjecture verb - To decide the size, amount, number, or distance of (something) without actual measurement.
Usage example: he conjectured that the theater could seat 1000 people more or less
Reason and conjecture are semantically related in reasoning topic. In some cases you can use "Reason" instead the word "Conjecture" as a verb or a noun, when it comes to topics like deduce.
Reason
Reason verb - To form an opinion or reach a conclusion through reasoning and information.
Usage example: she reasoned that since all of the cakes were on sale for the same price, she might as well pick the biggest one
Conjecture and reason are semantically related in reasoning topic. Sometimes you can use "Conjecture" instead the word "Reason" as a verb or a noun, if it concerns topics such as deduce.
Mutual synonyms
Both words in one sentence
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The Tangean Royals as a race have pointed ears... and telepathic abilities... Again, pure conjecture, but is it just possible that the Grubs wear red for a reason?
Cite this Source
Reason and Conjecture. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/conjecture/reason
Conjecture & Reason. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/conjecture/reason>.
Reason or Conjecture. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/conjecture/reason.
Google Ngram Viewer shows how "conjecture" and "reason" have occurred on timeline