Loosen
Part of speech: verb
Definition: make something less tight; unfasten
Example sentence: If I'm doing comedy, I try to improvise a lot. Even if they don't use it, it helps me loosen up and figure out the character.
Relax
Part of speech: verb
Definition: To make something loose.To become loose.To make something less severe or tense.To become less severe or tense.To make something (such as codes and regulations) more lenient.(of codes and regulations) To become more lenient.To relieve (something) from stress.
Example sentence: Your mind will answer most questions if you learn to relax and wait for the answer.