“وَ” (wa)a joining word meaning “and.” It connects this word to what came before.Corpus grammarCONJ — prefixed conjunction wa (and).
“كَانُ” (kānu)means “And were” in this verse. It is a verb. an action or state word. Here it is perfect verb, third person — masculine — plural.Corpus grammarV — third person masculine plural perfect verb.
“وا” (wā)an attached pronoun meaning “they” or “them.”Corpus grammarPRON — third person masculine plural subject pronoun.