bibliotaph
One who "buries" books, typically by hoarding them unread, hiding them, locking them away, or otherwise shutting them up and keeping them from use
rare
He was, by his knowledge of the intellectual value of his store, a little bit of a bibliotaph: we have reason to think he had this feeling to an extent he knew nothing of himself.
Where it comes from
From French bibliotaphe, from biblio- + Ancient Greek τάφος (táphos, “burial, tomb”). By surface analysis biblio- + -taph.
Adapted from the Wiktionary entry bibliotaph (CC BY-SA 4.0).