malapropism 

   [mal′ə präp′iz′əm]  .  noun

  1. Using the wrong word for something, especially one that sounds similar.

    An example of malapropism was Archie Bunker from the American television sitcom All in the Family saying "Patience is a virgin," when he meant to say "Patience is a virtue."
I had often seen this at work and reading articles online, and often while I am typing myself. Most common ones at work are:
   STUFF, instead of STAFF, and
   CARRIER instead of CAREER
and the one from this morning's reading:
   PROSPECTIVE instead of PERSPECTIVE