as yet vs more and more

as yet

adv
  • Up to the present; thus far. 

more and more

adv
  • Progressively more. 

  • Indicates that the statement is becoming progressively more true. 

  • In a manner that progressively increases. 

det
  • Increasingly more; a growing number of; a growing quantity of. 

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