“وَ” (wa)a joining word meaning “and.” It connects this word to what came before.Corpus grammarCONJ — prefixed conjunction wa (and).
“الْ” (al)the Arabic equivalent of “the.” It makes the following noun specific.Corpus grammarDET — prefixed definite article.
“حَبُّ” (ḥabbu)means “And the grain” in this verse. It is a noun. a naming word. Here it is masculine, nominative.Corpus grammarN — nominative noun.