Is cytochrome a coenzyme?

A nonprotein compound that combines with an inactive enzyme to form an active enzyme system.

I think if I remember well is a group of proteins or enzymes that belong to the superfamily of HEME. The metal involved has to be Fe, due to its magnetic powers to exchange protons in molecules...

The term 'cytochrome' means (biochemistry) a class of hemoprotein whose principal biological function is electron transfer (especially in cellular respiration)

Coenzyme A is a coenzyme, notable for its role in the synthesis and oxidation of fatty acids, and the oxidation of pyruvate in the citric acid cycle

Nonproein organic molecule that aids the action of the enzyme to which it is loosely bound.