These days, MS Word documents are saved in an open XML-based DOCX format, which is standardized and has a definitive file signature which can be easily picked up by Deep Scan. Older MS Word document files were identified by .DOC extension, and are also supported by Disk Drill's Deep Scan binary reconstruction method.
Alternatively, it's also smart to always check the items found by Quick Scan. Even though this Word document recovery algorithm locates less deleted files due to the way Mac OS X works, than the similar algorithms on Windows, it can still find multiple instances of recently deleted files. Anyway, Disk Drill, being a great free Word file recovery app on Mac, provides several methods sheltered under one central "Recover" button, and in most cases it does the best job possible.