In post #9, you had already closed the doc and quit word by the True in the 2nd called routine. Whether to close the doc and quit Word is up to you.
Maybe:
Sub ReplaceWordAndCopyPasteImage()
Dim wdApp As Word.Application
Dim Wks As Excel.Worksheet
Dim wdDoc As Word.Document
Set Wks = ActiveSheet
On Error Resume Next
Set wdApp = GetObject(, "Word.Application")
If Err.Number <> 0 Then
Set wdApp = CreateObject("Word.Application")
End If
On Error Goto 0
wdApp.Visible = True
Set wdDoc = wdApp.Documents.Open("C:\Users\Admin\Google Drive\SMS TEMPLATES\02 RISK ASSESSMENTS\001 Electrical works RA.docx")
Call ReplaceWords(wdDoc, Wks, False)
'Call CopyPasteImage(wdDoc, Wks, True)
CopyPasteImage wdDoc, Wks, False
On Error Resume Next
wdDoc.Close
wdApp.Quit
Set wdDoc = Nothing
Set wdApp = Nothing
End Sub