Hover tanks

I don't want to be seen to be interefering in a argument but at what
point does a hovertank stop been a tank and start been a ship.

It's called the Zubr and its better armed than some warships (not
suprisingly since thats what it is)

 foxxaero.homestead.com/indrad_068.html 

It is quite feasible to build a hovertank.  It's just that it would NOT
look like a land bound MBT but more like a HOVERCRAFT/WARSHIP.