expounder

Noun

Meaning

One who expounds or explains; an interpreter.

Source: Webster's dictionary

expositor apostle herald paladin interpreter lecturer exponent friend critic champion ally advocate protagonist patron warrior

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carper challenger cynic audience critic attacker

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Newtonian physics found its apostle in Kant; modern physics is still awaiting its modern expounder. Joseph B. Soloveitchik

As a result, many people began calling him the Great Expounder of the Constitution. Source: Internet