こくばん黒板kokuban
1.

A flat surface, typically made of a dark material, used in educational settings for writing or illustrating information with chalk, which allows for easy erasure and rewriting.

2.

A writing board often found in classrooms, characterized by its ability to display text or drawings created with white chalk, sometimes available in green, facilitating visual teaching and communication.

Example:

黒板に書きますね。

こくばんけ黒板消kokubankeshi
1.

A tool used for removing chalk marks from a blackboard surface, typically made of felt or cloth attached to a wooden or plastic base.

2.

An accessory commonly found in classrooms that helps maintain the cleanliness of a blackboard by erasing written notes or drawings.

3.

An implement designed to wipe away chalk particles, facilitating a clear writing space on blackboards for teachers and students.