原則 規則 原理 圓規 規矩

principle: 原理, 原則
principle of uncertainty: 測不準原理

as a matter of principle: 原則問題 , 依原則來說
a man of principle: 有原則的人

rule: 規則, 規矩
ruler: 尺
圓規:compass -> 羅盤

What's the difference between principle and rule?

Principle comes from reasoning but
Rule comes from powering