We don't have synonyms for publick yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are public, Public and publics.
(adj) :
Obsolete spelling of public. [Able to be known or seen by everyone; happening without concealment; open to general view.]
(n) :
Obsolete spelling of public. [(countable, uncountable) Chiefly preceded by the: members of the community or the people in general, regardless of membership of any particular group.]
(adj) :
Obsolete spelling of public. [Able to be known or seen by everyone; happening without concealment; open to general view.]
(n) :
Obsolete spelling of public. [(countable, uncountable) Chiefly preceded by the: members of the community or the people in general, regardless of membership of any particular group.]