We don't have synonyms for preeve yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are reeve, peeve and Reeve.
(v) :
Obsolete form of prove. [(transitive) To demonstrate that something is true or viable; to give proof for; to bear out; to testify.]
(n) :
Obsolete form of proof. [(countable) An effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.]
(v) :
Obsolete form of prove. [(transitive) To demonstrate that something is true or viable; to give proof for; to bear out; to testify.]
(n) :
Obsolete form of proof. [(countable) An effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.]