We don't have synonyms for pavais yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are pavis, palais and pavans.
(n) :
Alternative form of pavis. [(military, history) Most usually, a very large shield fitted with a stand, like a small moveable wall, carried in front to protect all or most of the bearer's body that could be positioned independently of the user, such as a crossbowman, often with a projecting ridge running vertically down the center. However, smaller, more standard shield types were also termed as such, with the central verticle ridge as a defining feature.]
(n) :
Alternative form of pavis. [(military, history) Most usually, a very large shield fitted with a stand, like a small moveable wall, carried in front to protect all or most of the bearer's body that could be positioned independently of the user, such as a crossbowman, often with a projecting ridge running vertically down the center. However, smaller, more standard shield types were also termed as such, with the central verticle ridge as a defining feature.]