"Warrior" (ウォリアー Woriā) is an archetype of primarily Warrior-Type monsters, which are used by Yusei Fudo in the anime. All of their Japanese names are comprised of English words transliterated into Japanese followed by 「ウォリアー」 ("Warrior").
In the anime, Yusei uses "Warrior" Synchro Monsters that require a corresponding "Synchron" Tuner to Summon (the first word of the Tuner's name is the same as the first word of the Synchro Monster's name). In the manga, he uses mostly EARTH-Attribute "Warrior" Synchro Monsters that do not require a corresponding "Synchron" monster.
The non-Synchro "Warrior" monsters work in conjunction with the "Synchrons" to easily Synchro Summon Synchro Monsters, including the "Warrior" Synchro Monsters. For example, "Level Warrior" can change its Level to make a Synchro Summon easier.
Each "Warrior" that requires a "Synchron" follows its own distinctive color scheme and has a different Attribute. However, "Quickdraw Synchron" can be used in place of any "Synchron" monster to summon any "Warrior" that requires a "Synchron" Tuner. There is currently no WATER "Warrior" Synchro.