“بِ” (bi)means “in / with / by.” It is a preposition: it links this word to the next word or phrase.Corpus grammarP — prefixed preposition.
“أَيْدِى” (ʾaaydiā)means “In (the) hands” in this verse. It is a noun. a naming word. Here it is feminine — plural, genitive.Corpus grammarN — feminine plural genitive noun.