a-back vs beyond

a-back

prep
  • behind, at the back 

beyond

prep
  • On the far side of. 

  • Later than; after. 

  • Further away than. 

  • Greater than; so as to exceed or surpass. 

  • In addition to; supplementing. 

  • Past, or out of reach of. 

  • Not within the comprehension of. 

adv
  • Farther along or away. 

  • In addition; more. 

  • extremely, more than 

noun
  • Something that is far beyond. 

  • The unknown. 

  • The hereafter. 

How often have the words a-back and beyond occurred in a corpus of books? (source: Google Ngram Viewer )