Why is "arch" pronounced like "arch(curvature)" in archbishop but like "ark(big ship)" in archangel?
I've found out the the "arch" part of archbishop, archrival, archtraitor, archpriest, archdiocese, archduke, archfiend, archlute, archconservative, archconfraternity
is pronounced as "arch(curvature)"
but like "ark(big ship)" in archangel, archimage.
It seems that in all of the words above the part "arch" has the same origin but what makes them pronounced differently?