“وَ” (wa)a joining word meaning “and.” It connects this word to what came before.Corpus grammarCONJ — prefixed conjunction wa (and).
“نَجِّ” (najji)means “And save us” in this verse. It is a verb. an action or state word. Here it is verb pattern two, second person — masculine — singular.Corpus grammarV — second person masculine singular imperative verb.
“نَا” (nā)an attached pronoun meaning “we” or “us.”Corpus grammarPRON — first person plural attached pronoun.