Let out and Set free

Let out verb - Express audibly; utter sounds (not necessarily words).

Set free and let out are semantically related in discharge topic. In some cases you can use "Set free" instead a verb "Let out", when it comes to topics like free, liberate, give freedom.

Set free verb - Grant freedom to.

Let out and set free are semantically related in discharge topic. Sometimes you can use "Let out" instead a verb phrase "Set free", if it concerns topics such as free, release, liberate, give freedom.