Cases of word usage

1) of a door slightly open (ajar)

2) a kind of riddle using a play on words, e.g. 'When is a door not a door?' - 'When it's ajar.' (conundrum)

3) (to make) a sound like an unoiled hinge of a door (creak)

4) an opening, gate, door etc by which people enter (entrance)

5) a border in which a picture, photograph, window or door is enclosed or set (frame)

6) a long, hollow area in the surface of a hard material, especially one made for something that slides along it, e.g. a sliding door or window (groove)

7) a (usually) long space into which the main entrance or front door of a building opens (hall)

8) a joint on which a lid, door or gate turns or swings; the central principle on which something depends (hinge)

9) a fastening for a door or gate, with a bar falling into a catch and being lifted by a small lever (latch)

10) a horizontal piece of wood or stone forming the top of the frame of a door or window (lintel)