Open English Wordnet
Nouns
(n)thresholdthe starting point for a new state or experience“on the threshold of manhood” (n)doorway, door, room access, thresholdthe entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close“he stuck his head in the doorway” (n)doorsill, doorstep, thresholdthe sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway