teach· er ˈtē-chər 1 : one that teaches especially : one whose occupation is to instruct 2 : a Mormon ranking above a deacon in the Aaronic priesthood Synonyms educationist [ chiefly British] educator instructor pedagogue pedagog preceptor schoolteacher See all Synonyms & Antonyms in Thesaurus Example Sentences Experience is a good teacher.

https://www.merriam-webster.com/dictionary/teacher