How to pronounce arch

This generally accepted pronunciation (ar-kuh-PEL-uh-go) is the only one given in The American Heritage Dictionary of the English Language (4th ed.)

arch·an·gel

A high-ranking angel. 2. archangels The eighth of the nine orders of angels in medieval angelology. [Middle English, from Old French archangele, from Late Latin archangelus, from Late Greek arkhangelos : Greek arkh-, archi- + Greek angelos, angel.]