Kennings were figurative phrases used to replace common nouns, often using metaphors or descriptive imagery. Since the concept of "teacher" in the modern sense was different in those times, there wasn't a strong need for a specific kenning.
However, you could create your own kennings for "teacher" based on their role:
* "Wisdom-giver" - emphasizing their knowledge.
* "Mind-opener" - referencing their ability to expand understanding.
* "Knowledge-weaver" - symbolizing the way they connect ideas.
* "Word-shaper" - alluding to their ability to explain and communicate.
Remember, kennings were creative and metaphorical, so you can use your imagination to come up with your own fitting phrases.