棚 shelf

I keep two organs on my wooden shelves. (FYI: I'm Ed Gein)

bookcase ★★★☆☆ KUNKUN
本 (book / the real) + 棚 (shelf) = 本棚 (bookcase )

a whole bookcase (BOOBOO: 'tana'　（棚） by itself means an individual shelf of a hondana)

cupboard ☆☆☆☆☆ KUNKUN
戸 (door) + 棚 (shelf) = 戸棚 (cupboard)