A family of Microsoft word processing software products for creating web, email, and print documents.
There is only one way I have found that actually purges downloaded word files from an android device and that is to go into apps menu, click on Word and select "clear data." This will clear all word data, your settings etc and the next time you use word, it will act like it's the first time you've used it. Until Microsoft and its brilliant engineers correct this odd Word behavior I am afraid that is the only solution available to delete files.