Word for Mac Problem

I am using a late '09 IMac 21" with Yosemite and Office 11 and have been using my Word to create pages of Obits and pictures for a group of Veterans. Somehow one of the pages ( or documents ) has more than doubled in size ( Mg ) from about 5Mg to over 10Mg and I can't see a reason for the change nor remember what I did to cause it to happen. Here are screen shots, both about the same word and characters but one is twice as big;