The coding for this is going to be simplest if you (temporarily) paste the abbreviations table into the main document to run this code. This code assumes you pasted the table at the very end of the document.
Code:
Sub CheckAcroInUse()
Dim aTbl As Table, sAbb As String, aRng As Range, aCell As Cell
Set aTbl = ActiveDocument.Tables(ActiveDocument.Tables.Count)
Set aRng = ActiveDocument.Range(0, aTbl.Range.Start)
For Each aCell In aTbl.Columns(1).Cells
sAbb = Split(aCell.Range.Text, vbCr)(0)
If InStr(aRng.Text, sAbb) = 0 Then
aCell.Range.HighlightColorIndex = wdYellow
End If
Next aCell
End Sub