They essentially mean the same thing, but no, I wouldn't say they're interchangeable. "Teacher" is usually used to describe those who teach at the high school level and below. However, even a person who teaches band at the high school level is usually referred to as an "instructor".
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GrammarGirlThey essentially mean the same thing, but no, I wouldn't say they're interchangeable.Isn't it a paradox? If they basically mean the same, then how come they aren't interchangeable?
GrammarGirlHowever, even a person who teaches band at the high school level is usually referred to as an "instructor".