Hmm - to me both a 'pantry' and a 'closet' is a small room, not a piece of furniture. Your house either has a pantry (or two, in the case of the one I grew up in), or doesn't (like this one). Modern houses rarely have a pantry, because we have fridges these days.

Same with a closet - you either have a wee room opening off a bedroom, or you don't.

In neither case can you just bung a big cupboard there and declare it to be the room that you don't have. It's like putting a big cupboard on the upstairs landing and calling it the spare bedroom.