We don't have synonyms for pospolite yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are pisolite, podolite and rosolite.
(n) :
(historical, military) A former militia in the Kingdom of Poland and the Polish–Lithuanian Commonwealth, consisting of the gentry, which, was summoned to defend the country in the event of an invasion
(n) :
(historical, military) A former militia in the Kingdom of Poland and the Polish–Lithuanian Commonwealth, consisting of the gentry, which, was summoned to defend the country in the event of an invasion