Head
Just as we refer to the CEO or president as being the "head" of a company. God calls Jesus Christ the "head" of the church. The church is not one particular congregation or denomination, but all people - past, present and future - who trust Jesus Christ as Savior. By calling Christ the "head," God is saying that Jesus is the supreme leader and authority over all.

Christ is the head of the church.
Ephesians 1:22-23; 4:15-16; 5:23
Colossians 1:18; 2:9-10