Is "temporary substitute" redundant? For example,
Mrs. Williams is the temporary substitute teacher.
Would "temporary substitute" be redundant in this case? According to Merriam-Webster, the definition of a substitute is
A person or thing that takes the place or function of another.
To me that could mean that the person or thing is taking the place of another, but it's still the other's place. But it could mean that the person or thing is replacing the "another" in question.
Certainly in conversation when a person says "Mrs. Williams is the substitute teacher" that implies it's temporary. "Replacement" would be the word if it was permanent.