catflap.org Online Dictionary Query

  became extinct /bɪkˌeɪm ɛkstˈɪŋkt/
  starb aus
     Synonyms: died out, suffered extinction
  
   see: die out, suffer extinction, become extinct, dying out, suffering extinction, becoming extinct, died out, suffered extinction, become extinct, dies out, suffers extinction, becomes extinct
  

  became extinct /bɪkˌeɪm ɛkstˈɪŋkt/
  erlosch
     Synonyms: expired, lapsed terminated, was terminated
  
   see: expire, become extinct, lapse, terminate, be terminated, expiring, becoming extinct, lapsing, terminating, being terminated, expired, become extinct, lapsed, terminated, been terminated, expires, becomes extinct, lapses, terminates, is terminated, unextinguished, a mortgage is extinguished, The claim is extinguished by prescription., The country ceases to be a member.