We don't have synonyms for perswade yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are persuade, pervade and pesade.
(v) :
Obsolete spelling of persuade. [(transitive) To successfully convince (someone) to agree to, accept, or do something, usually through reasoning and verbal influence.]
(v) :
Obsolete spelling of persuade. [(transitive) To successfully convince (someone) to agree to, accept, or do something, usually through reasoning and verbal influence.]