Paseriform or Passeriform: How To spell?
The word Paseriform is misspelled against Passeriform, an adjective meaning "Like or belonging to the Passeres."
Passeriform has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings pa & eriform which should not be misspelled with single 'S'
Wrong Spelling:  pa-s-eriform  Correct Spelling:  pa-ss-eriform 
Find more incorrect spellings of Passeriform to spell right way.