“ذُو” (dhuw)means “Owner (of) the Throne” in this verse. It is a noun. a naming word. Here it is masculine — singular, nominative.Corpus grammarN — masculine singular nominative noun.
“الْ” (al)the Arabic equivalent of “the.” It makes the following noun specific.Corpus grammarDET — prefixed definite article.
“عَرْشِ” (ʿarshi)means “Owner (of) the Throne” in this verse. It is a noun. a naming word. Here it is masculine, genitive.Corpus grammarN — genitive noun.