St. Athanbaron V. Nuszuro is an incredibly powerful person a piece the world Being one of the Five Elders, he has great power up his sleeve that can rival and potentially surpass even Yonko. Nuszuro is a powerful swordsman who wields one of the highest grade blades called Shodai Kitetsu.
On top of that, he has other powers to aid him in battle, such as his pact with Nerona Emu, and it's clear to fans that he can't be matched by the vast majority. He said, there are some people a piece A world that can take him and fight him and hold him effectively.

One Piece: Every Top Tier Swordsman's Haki in The Last Saga, Ranked
These one piece swordsmen have more than just sword skills going for them. They have also won hockey.
8
In Shimotsuki Ryu
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Sword: Shusui
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Hockey: Weapons, Overview
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Devil Fruit: None
Ryuma is a legendary swordsman who once lived in the land of Wano. He was the bearer of Shusui and was hailed as a sword god in his time. Ryuma was able to move a dragon long and far, which was nothing short of impressive.
He was a user of Armament and Observation Haki, but we don't know at this point in the story if he had Conqueror Haki or not. After all, Ryuma was a legendary samurai, and based on his exploits alone, he would definitely stand a chance of beating Nusjuro.
7
Silver Raleigh
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Sword: Unknown Saber
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Hockey: Weapons, Observations, Winners
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Devil Fruit: None
Silver Ray was the Pirate King's right-hand man, and an extremely powerful swordsman. Rayleigh relied on his tremendous Haki in battle. Fans know him as a user of all three types of Haki, and he has advanced at least 2 types to a very high grade. He can also wear his sword coat over the Conqueror's Haki, as seen recently.
In his prime, he would have been able to fight any Yonko in a fight, whether he won or lost. This means that he can even beat Nuszuro in a fight. His monstrous powers earned him the title of Dark King, and that's a title not for show.
6
St. Garling Figarland
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Sword: Unknown
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Hockey: Weapons, Overview
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Devil Fruit: Unknown
Garling Figerland is the former leader of the God's Knights, who was recently promoted to the rank of Five Elder, meaning he is on par with Nuszuro. Fans know that he is incredibly powerful. He has an unknown saber that looks like Shanks' sword. Given that he has a relationship with Shanks, it's only natural that he has great potential up his sleeve.
Her power level is not shown in the story, it is quite easy to guess, Oda himself said that Garling is very powerful. Furthermore, the dragon itself is wary of a world government unit known as the Knights of God, and Garling was recently at the top of it. His sheer power must be absolutely incredible. He was also the champion of the Lord Valley long ago, and he had Roxas D. Despite losing to Jabek, he has become very powerful since then. All things considered give us ample proof of the fact that He is extremely powerful.
5
Dracul Mihawk
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Sword: Yoru
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Hockey: Weapons, Overview
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Devil Fruit: None
The strongest swordsman in the world, Dracul Mihawk would certainly be able to hold his own against Nuszuro in a fight. Mihawk is an amazing user of at least two types of Haki. He has a sword of the highest grade, and is also one of the few people to have his blade permanently blackened.
Mihawk is extremely powerful and the power he possesses can only be rivaled by a select few. In terms of overall swordsmanship, Mihawk should be around the same level as Nuszuru. However, he does not seem to have a covenant with Nusjuro. Still, his overall skill with Haki and Yoru gave him an advantage against anyone.

The 9 Strongest Pirates That Yonko Are Not In One Piece, Ranked
Yonko are powerful, but they aren't the only strong pirates in one piece.
4
Kozuki Oden
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Sword: Enma, Ame no Habakiri
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Hockey: Weapons, Observations, Winners
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Devil Fruit: None
Kozuki Oden was one of the most legendary samurai to appear in the world of One Piece. According to Kaido, he is a pirate in the same league as Whitebeard, Roger, Rox, and Shanks. While he wasn't at the level he was when he fought against the likes of Whitebeard and Roger, once he returned to Wano, he was canonically said to be many times stronger.
Oden was able to hold his own in the fight against Yonko Kaido and potentially kill him with his incredible use of Victory Haki. In fact, he actually managed to give Kaido post-traumatic stress even decades after his death. Of course, he would be able to hold his own brilliantly against Nuszuro.
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3
Rocks D. Xebec/Harald
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Sword: Eclipse (Rock), Nameless Legendary Sword (Harald)
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Haki: All 3 types
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Devil Fruit: None
Rox was a famous pirate everywhere a piece Known to have great power in the world. He attacked Marijoa 56 years ago and easily killed an admiral. His special ability was to coat his blade in powerful Haki and shoot blunt hammer-like shockwaves from his blade that crushed everything in his path.
Harald, King of Elbaf, was his best match and both were equal in skill. Harald was extremely skilled with the sword and together, the two could destroy anyone who stood in their way. Harald was also a user of Conqueror's Haki Coating and with it, he could easily wipe out cities and countries. At his peak, Harald was a monster that could destroy an entire world, and this makes him the strongest of the factions that could potentially even defeat Nuszuru.
2
Shanks
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Sword: Gryphon
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Hockey: Weapons, Observations, Winners
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Devil Fruit: None
One of the four emperors of the sea, Shanks is a mighty powerful man who is feared throughout the world. He may not call himself a dainty swordsman, though, as he does have a magnificent saber named Gryphon that he often wields in the Haki of Conquerors.
Shanks has enough power to take down almost anyone in a fight. If there's one person who can go toe to toe with the likes of the most powerful people in world government, it's Shanks.
1
Goal de Roger
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Sword: Ace
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Haki: All 3 types
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Devil Fruit: None
Roger was the most feared swordsman of his era and certainly a monstrously powerful man. Roger wielded the famous Blade Ace, which is also the highest grade. He coated it in both Armament and Conqueror's Haki, and the blows from his sword felt like crushing shock waves instead of cutting through them. Roger was very powerful in his prime, and definitely one of the most monstrous fighters who could definitely defeat Nuzuro.
One piece is available to read on Manga Plus.