It's a bit different in ol' English. Our terminology for positions is up for debate most of the time but I consider thusly: A Centre Foward is a Striker that plays through the middle. With the term CF I think of mainly a big number 9, a target man, like Andy Carrol or Drogba. Messi is a Striker but isn't a CF, even though he plays through the middle. Pedro is also a Striker even though he plays out wide and still isn't a CF. I don't know, it's all semantics.