We don't have synonyms for bannerets yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are banneret, lannerets and banners.
(n) :
(military, historical) A proposed but unadopted senior commissioned rank of the Royal Air Force equivalent to group captain.
(n) :
(law, historical) Clipping of knight banneret, a knight entitled to subinfeudate his estate and to lead men in battle under his own banner. [(law, historical) A knight entitled to subinfeudate his estate and to lead troops under his own banner.]
(n) :
(military, historical) A proposed but unadopted senior commissioned rank of the Royal Air Force equivalent to group captain.
(n) :
(law, historical) Clipping of knight banneret, a knight entitled to subinfeudate his estate and to lead men in battle under his own banner. [(law, historical) A knight entitled to subinfeudate his estate and to lead troops under his own banner.]