Perhaps category names would work here e.g.
class="glossary category-noun"
for things in the "noun" category. I'm not sure how that would internationalize though.
Glossary
Can Glossaries be linked to some kind of css
Αυτή η συζήτηση κλειδώθηκε κι έτσι δεν μπορείτε να απαντήσετε σε αυτή.