next to vs on top of that

next to

prep

  • Compared to, in comparison with. 

  • Beside, alongside, by, adjacent to, or near. 

  • Immediately after, in choice or consideration; aside from. 

adv

  • Almost; nearly, well-nigh. 

on top of that

prep

  • Also, additionally, moreover. 

How often have the words next to and on top of that occurred in a corpus of books? (source: Google Ngram Viewer )