Are these 2 playing or fighting?

The puppy is a 15 week old female and the older one is a 1.5 year old male who is neutered. They constantly do this everyday. I work from home, and I keep them separated mostly because I want to keep an eye on the puppy while I work and also because of this. I’m worried my boy is goi g to hurt the little girl (15lbs vs 5lbs). To me it looks like they are playing but I know sometimes fighting can look like playing. Thoughts?