Church [Old English cirice, circe; Middle English chereche, chiriche, chirche; whence churche, cherche, etc.: -Greek Kuriakon...] which means "belongs to, or pertaining to, a lord." It may have first been used in relation to pagan gods.
Ecclesia [mediaeval Latin, and Greek - from : SUMMONED] -A regularly convoked assembly, especially the general assembly of Athenians.
The King James bible translators replaced the original word "ecclesia," with the word church.
The two words church and ecclesia have different meanings. I understand that the word of God cannot be broken, therefore the word church was added. My concern is the following...
"I testify to everyone who hears the words of prophecy in this book: If anyone adds to them, God will add to him the plagues described in this book." - Revelation 22:18
I know it's just a word...maybe it's nothing. Just don't tell me that the KJV is flawless, because I know better.
(sources: aggresivechristianity.net and others.)