(This list was copied from the official readme file at
https://github.com/hakz/vntagger-gate-plugin.vntagger/blob/master/README.txt)

The tagset for the Vietnamese language contains 17 main lexical tags and one tag for unrecognised token:

1. Np – Proper noun
2. Nc – Classifier
3. Nu – Unit noun
4. N – Common noun
5. V – Verb
6. A – Adjective
7. P – Pronoun
8. R – Adverb
9. L – Determiner
10. M – Numeral
11. E – Preposition
12. C – Subordinating conjunction
13. CC – Coordinating conjunction
14. I – Interjection
15. T – Auxiliary, modal words
16. Y – Abbreviation
17. Z – Bound morphemes
18. X – Unknown

There are also tags for delimiters and punctuations.