as and when vs on account of

as and when

conj
  • as soon as 

on account of

conj
  • On account of the fact that: because, since. 

prep
  • Because of, due to, owing to. 

  • On behalf of the (monetary) account of; (idiomatic, originally figurative) for the sake of. 

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