the way I see it is that: endurance often reflects on what someone can withstand mentally (ex. pain)...durability is what someone can withstand physically (ex. attacks)
If someone got hit by a TBB and they got knocked out by it yet there isn't a scratch on their body then it's durability
If someone got hit by a TBB and still stood afterwards yet their body is extremely damaged and bleeding then it's endurance
If tsunade was physically durable to an extent then she would of never got cut in half...her body would of still been intact to a degree. Similar to how the 3rd raikage was after being hit with rasenshuriken...but since she was cut in have and still managed to push and heal herself despite the pain it can be considered endurance...
both are similar words but with very different meanings
Cannot be similar with very different meanings.
And you are using what you believe to be durability and endurance. However, the actual words say the same.
Durability: 1. Capable of withstanding wear and tear or decay: a durable fabric.
2. Able to perform or compete over a long period, as by avoiding or overcoming injuries: a durable fullback.
3. Lasting; stable: a durable friendship.
^^^^^^^ All that is the same endurance.
Having hard bodies doesn't make you more durable. It simply means you take less damage. However, durability is about taking damage and still surviving. HOWEVER,
DURABILITY IS APPLIED TO NON-LIVIING THINGS. Living things have too many factors to be considered, hence we use the word "endurance" for living things.