downstream vs underneath

downstream

adv
  • Following the path of a river or stream 

adj
  • Further along in the flow of current, in relation to a river, stream, bloodstream, or other flow of fluid. 

  • In the direction from the server to the client. 

  • Towards the 3′ end of a DNA molecule. 

  • Occurring later than something else; (also, usually, especially) influenced by something else; being a consequence of something else. 

verb
  • To stream downward. 

underneath

adv
  • Below; in a place beneath. 

  • On the underside or lower face. 

adj
  • Under, lower. 

noun
  • The lower surface or part of something. 

  • A background radio sound track played during a specific announcement or program. 

prep
  • Under the control or power of. 

  • Under, below, beneath. 

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