The difference between the expelliarmus and accio spells

[Tom Wall <thomasmwall@yahoo.com>]

No: HPFGUIDX 50578

Steve wrote:

We come back to the wizard's intent. Ron knocked out a troll using the
wrong spell. He used 'levitate a feather' when he should have used
'levitate wood' (or something equivalent). Yet his intent was so
strong, that it worked anyway.

Me:

Doesn't 'wingardium leviosa' mean something like "wings high, take 
flight?" to use the latin liberally?

In a sense, couldn't that apply to anything?  Wingardium Leviosa is a 
levitation charm, right?  Why necessarily feathers?  

-Tom