on account of vs on the grounds

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. 

on the grounds

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