We don't have synonyms for nonspeak yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are nonpeak, newspeak and unspeak.
(n) :
Speech that is intended to satisfy a needed response, yet lacking in any real pertinent information; speech about nothing, empty words; useless talk or babble.
(n) :
(rare) An aversion to speaking; speechlessness.
(n) :
Speech that is intended to satisfy a needed response, yet lacking in any real pertinent information; speech about nothing, empty words; useless talk or babble.
(n) :
(rare) An aversion to speaking; speechlessness.