The word "demonstrableness" refers to the ability to be proven or demonstrated. Synonyms for this word include demonstrability, provability, verifiability, confirmability, and ascertainability. Another word that can be used in place of "demonstrableness" is evidentiary, which means providing evidence to support a claim or argument. These synonyms are useful for expressing the idea of something being able to be proven or demonstrated in a clear and convincing manner. When we use synonyms, we can vary our language to avoid repetition and express our thoughts in a more nuanced way.