Incorrect termbase term not flagged up as an error

In my termbase, the translation for 'elektrische terminaltrekkers' should be 'electric terminal trucks'. If I put in 'electric terminal lorries' it doesn't flag up as an error. I'm guessing because I also have 'CNG-trekkers' as 'CNG lorries' in my termbase. Is there any way of getting round this? I have a field called 'Forbidden' with a picklist (yes/no).