Co and Don

Co noun - A hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition.

Don and co are semantically related. in leader of military or other organization topic. In some cases you can use "Don" instead a noun "Co".

Don noun - Teacher at a university or college (especially at Cambridge or Oxford).

Co and don are semantically related. Sometimes you can use "Co" instead a noun "Don".