Estero is a Spanish word for Estuary - a place where fresh water meets the salt water of the sea. The Holy Spirit is symbolized as fresh water in scripture, and the seas often represent the people of the world.
Ekklesia = much more than the common definition of "called out ones"
Yes, the church (Body of Christ) is made up of "called out ones", but we are more than that. We are actually called to be ushering in the government of Heaven.