The word 'church' (kirkko) does not only refer to the building. It has several more important meanings. 

Look for this article:https://en.wikipedia.org/wiki/Christian_Church

Read the text under these titles:
* etymology
* use by early Christians
* catholic tradition (first paragraph)
* orthodox tradition (first paragraph)
* visible and invisible church (three paragraphs from the beginning)

Find 5 different meanings for 'church'. Explain them, write to a Word-document and save to a file.