The question is at the top. ^^ (version is above)
In the latest versions I think from 1.14
Theoretically yes, but what does that do you besides more damage? ^^
That's fine.
Yes you can, and this has been going on for some time.
The ax still gets two durability points deduction. Say: As if they were being used incorrectly (like digging up earth with a pickaxe).
Strictly speaking, the ax is stronger than the sword, but can't strike again as quickly
https://minecraft-de.gamepedia.com/...h%C3%A4rfe
Here you can see under "Sharpness" which tools can be enchanted
In theory, you can enchant even a stick with sharpness
That's the point of sharpness
