any more vs thenceforth

any more

adv
  • Now, from now on. 

  • Used other than figuratively or idiomatically: see any, more. 

  • From a given time onwards; longer, again. 

thenceforth

adv
  • From that time on. 

How often have the words any more and thenceforth occurred in a corpus of books? (source: Google Ngram Viewer )