I search for a term on Google : I have 94 results, another one with his own computer : 14,300. Why?

On a forum we argued about the usage (or not) of an abbreviation.

I said : MSORPG isn't a very used term. See my search with Google (94 results) :

The one with whom I argued replied : "Look, it is used a lot !" (14,300 results).

What can explain we have so much difference in our number of results?
I haven't checked any filter able to reduce my results (I think !).