“أَ” (ʾaa)This word asks a question, like “is?” or “do?”Corpus grammarINTG — prefixed intg particle.
“فَ” (fa)This is an extra supporting word used for Arabic grammar or emphasis.Corpus grammarSUP — prefixed sup particle.
“سِحْرٌ” (siḥrun)means “Then is this magic” in this verse. It is a noun. a naming word. Here it is masculine, not specific, nominative.Corpus grammarN — nominative indefinite noun.