Or (shortened) chur {khoor}; from an unused root probably meaning to bore; the crevice of a serpent; the cell of a prison -- hole.
H2352. chuwr
חֹר noble, חֻר חֹר, hole, see below II. חרר; הַגִּדְגָּד חֹר see below II. חור.
חרא, or חרה (√ of following; meaning unknown).
חוּר חֻר, noun [masculine] id. — collective חוּר Isaiah 42:22 as hiding-places of men; construct חֻר 11:8 hole of asp (מָּ֑חֶן).