Looking at some of what's in the tags and with my understanding of SuSe, at the moment I have to agree with @sysadmin1138:
We have opensuse and sles, which cover the differences between the two branches.
I think we can assume in our target audience ("professional" sysadmins) we'll be dealing mostly with SLES (the "enterprise" version), so the synonym makes sense to me -- in my (admittedly limited) experience when people have said SuSe they've _meant_ SLES (usually in the context of what was supported on early IBM BladeCenters).
If other OpenSuse folks weigh in to say this is a bad synonym I could get behind blackholing suse entirely to eliminate any chance of confusion, but if the two branches really are different from an admin standpoint I don't think having a standalone SuSe tag is a good idea.