Word-wise cut, copy and paste
From Vim Tips Wiki
created 2004 · complexity basic · author andyf · version 6.0
Word-wise cut, copy & paste over the current word. There's nothing special or magical about these bindings, just that I find them really useful for coding, and I thought I'd share.
Add the following lines to vimrc:
map <A-v> viw"+gPb map <A-c> viw"+y map <A-x> viw"+x
These bindings follow the Windows-style keys of control-V, control-C, and control-X; except using alt instead of control. Adjust to your preference.
I think <Esc>yiw is more convenient.