I'd have to say Hydrangeas too- at least that's what the larger white blossoms look like. The little ones probably open up further and turn white. I've seen the pink and blue ones like this so, that's what I'd say they are. Very pretty!
When I put this through PlantNet, I thought it might be confused about whether I meant the big or the small blossoms. It turns out both are part of this same plant, which PlantNet calls Japanese Snowball.
