Is sturdy a focus sash

No, "sturdy" and "focus sash" refer to different concepts in Pokémon. Sturdy is an ability that prevents a Pokémon from being knocked out in one hit, allowing it to survive with 1 HP if it is at full health. On the other hand, Focus Sash is an item that ensures a Pokémon will survive a hit with 1 HP if it is at full health, but it gets consumed afterward. Both provide similar protection but operate under different mechanics.