Defender 16
Dragon Slayer 17
Flame Tongue 23
Frost Brand 15
Holy Avenger 16
Luck Blade 13
Sun Blade 22
Sword of Sharpness 21
Sword of Life Stealing 8
Sword of Wounding 11
Vorpal Sword 14
A sword without a blade is not a sword. Plus it takes a bonus action to use it.
I bet all the downvotes for the VS are from DM's. +3 and occasional decapitation? Everything else on this list (except the HA) is poo in comparison.