In case anyone else runs across this thread in the future and are stuck trying to import the type library for MS Word (WinWord.exe), note that unlike with Excel where the type library can be imported from the .EXE file, with WinWord the Type Library is not embedded (it seems) in the .EXE file, so you run into an error if you try the same approach as above.
It turns out that for many Office applications the type library information is stored in .OLB files. For more on this see: https://docs.microsoft.com/en-us/office/troubleshoot/office-developer/use-type-library-for-office-from-visual-c-net
The full command i used to import the type libraries related to MS Word (WinWord) was:
"C:\Program Files (x86)\Embarcadero\Studio\18.0\bin64\tlibimp.exe" -P "C:\Program Files\Microsoft Office\root\Office16\MSWORD.OLB"
Adjust as required for the version of Delphi and/or Office you're using. The files will be created in the current folder, so be sure to be in the target folder before you run the command. The output is something like this:
C:\temp\import>"C:\Program Files (x86)\Embarcadero\Studio\18.0\bin64\tlibimp.exe" -P "C:\Program Files\Microsoft Office\root\Office16\MSWORD.OLB"
Embarcadero TLIBIMP Version 12.16581 [x64]
Copyright(c) 1995-2010 Embarcadero Technologies, Inc.
Opening C:\Program Files\Microsoft Office\root\Office16\MSWORD.OLB
Type library loaded ....
Created C:\temp\import\Office_TLB.dcr
Created C:\temp\import\Office_TLB.pas
Created C:\temp\import\VBIDE_TLB.dcr
Created C:\temp\import\VBIDE_TLB.pas
Created C:\temp\import\Word_TLB.dcr
Created C:\temp\import\Word_TLB.pas
C:\temp\import>
Hope that helps future me or some other soul... 🙂