The End
End, The Finish, Finish
noun
By now you should know that 終わる means "to end" or "to finish." So what is this noun-version of that word? It would be the end or the finish.
おわり
The reading comes from 終わる. So long as you know that word, you can learn this word's reading as well!
これで終わりだ。
This is the end.
終わり良ければ全て良し、でしょ？
All is well that ends well, right?
今週で仕事も終わりで、来週からはクリスマス休暇だー！あー、待ちきれない。
Work ends this week and Christmas holidays starts next week! Aww I can't wait for that.