An air fryer is a convection oven but more so.

When I looked a couple years ago there wasn’t a standard definition. But if you look at the specs of similar products from a specific manufacturer, you’d see air fryers moved more air than convection ovens

I had to get a new stove and wanted one with an air fryer but at the time there were none that were both induction stove and air fryer. I had to settle for convection oven but the only difference I found on the specs was more air movement. However the convection oven on this brand had more air movement than air fryer on a different brand

I don’t know if definitions have been standardized since then