Debian's which hunt

On the other hand on my system I have vim and nvim installed simultaneously. I also apparently have the following alias which I've forgotten about in .bashrc:
alias vim='nvim' in .bashrc

So when I execute the 'vim' command, actually 'nvim' is executed.

$ which vim
/usr/bin/vim
$ command -v vim
alias vim='nvim'

So in this particular case 'which' did not return the correct path. Perhaps this is due to the fact that 'vim' is a valid command. But if I executed 'vim', it would not execute the executable returned by 'which'. I found this by accident as I hadn't heard about 'command -v' before.