A synonym for document could be record, a written record. Other synonyms would be words for specific documents such as letter, certificate, receipt, note, form, deed, advertisement, etc.
logbook
files
Not sure
cachet
Logbook
the clipboard
Windows clipboard
The Document Stating the Separation of America From Great Britain
The Clipboard.
Another name for "will" is "volition," which refers to the act of making a conscious choice or decision. In legal contexts, "will" can also refer to a "last will and testament," which is a document specifying how a person's assets should be distributed after their death.
A procedural document may be called a process document or desktop procedure.
When you do a save, the changes are applied to the document you originally opened. When you do a 'save as', you have to choose a name and a location where a copy of the document will be saved; this copy will have changes you are currently making to the document. You can then exit the document without saving, and your original document is unchanged. The copy that you 'save as' is still intact, with changes. You can also do a 'save as' without making any changes, just to have another copy of the document existing with a new name and/or location.