Formal:
* Language Teacher: This is the most common and straightforward term.
* Language Instructor: Similar to "teacher," but can sometimes imply a more structured or formal setting.
* Linguistic Educator: Emphasizes the pedagogical aspect of teaching language.
* Foreign Language Teacher: Specifically refers to teaching a language other than the learner's native language.
Informal:
* Language tutor: This term implies a more personalized and individual approach to teaching.
* Language coach: Similar to "tutor," but may focus more on conversational skills and fluency.
* Language facilitator: Emphasizes the role of the teacher in guiding the learning process.
The best term to use will depend on the specific context and the level of formality required.