Teacher (noun)

1. A person who teaches, instructs or trains others, especially in a school or academic setting.
2. A person who imparts knowledge or skills to others.
3. A person who provides guidance and mentorship.
4. A person who leads or instructs others in religious or spiritual matters.
5. A person who provides leadership or direction.

Origin:

Derived from the old english word 'tǣcher' which means 'teacher, instructor'.

Examples:

1. She was a teacher at the local school.
2. He was a teacher of martial arts.
3. She was a teacher and a mentor.
4. The teacher was a spiritual guide.
5. The teacher was a leader in the community.