What is meant by "a profound knowledge of words" in dhp 352?

dhp 352 *A master is one who has let go of all craving and clinging to the world; who has seen the truth beyond forms, yet is possessed of **a profound knowledge of words**. Such a great being can be said to have finished the task.* [Sujato Translation, with pāḷi](https://suttacentral.net/dhp352/en/sujato?lang=en&layout=sidebyside&reference=none¬es=asterisk&highlight=true&script=latin) : Rid of craving, free of grasping, Vītataṇho anādāno, expert in the interpretation of terms, ***Niruttipadakovido;*** knowing the correct Akkharānaṁ sannipātaṁ, structure and sequence of syllables, Jaññā pubbāparāni ca; they are said to be one who bears their final body, Sa ve “antimasārīro, one of great wisdom, a great person. Mahāpañño mahāpuriso”ti vuccati.