at last vs sometime

at last

prep
  • In the end; finally; ultimately. 

  • After a long time; eventually. 

sometime

adv
  • At an indefinite but stated time in the past or future. 

adj
  • Occasional. 

  • Former, erstwhile; at some previous time. 

How often have the words at last and sometime occurred in a corpus of books? (source: Google Ngram Viewer )