Reason uses inference and logic to make sense of things. It is the broader ability that helps you think, analyze, compare, judge, and move from one idea to another. The three top-level inference engines are deduction, induction, and abduction.
Logic is the discipline that tests whether reasoning holds together. It checks structure, consistency, assumptions, contradictions, and fallacies. Logic helps you see whether a conclusion follows, whether an argument is sound, or whether the thinking has gone off track.
A simple way to say it is this:
Reasoning moves thought forward. Logic keeps that movement honest.
The two work together. Reasoning helps you explore ideas and form judgments. Logic helps you test those judgments. But logical coherence by itself does not guarantee empirical truth. An idea can make sense inside a fantasy world, a moral system, or a mathematical framework and still fail as a description of reality. As truth.
Coherence can establish logical truth within a framework, but coherence requires reality to establish empirical truth. To establish truth, you must let reality push back.