hap vs occur

hap

verb
  • To happen to. 

  • To wrap, clothe. 

  • To happen; to befall; to chance. 

noun
  • Any of the cichlid fishes of the tribe Haplochromini. 

  • A wrap, such as a quilt or a comforter. Also, a small or folded blanket placed on the end of a bed to keep feet warm. 

  • Happenings; events; goings-on. 

occur

verb
  • To happen or take place. 

  • To present or offer itself. 

  • To be present or found. 

  • To come or be presented to the mind; to suggest itself. 

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