What's the noun for jack? Here's the word you're looking for.
jack
A mechanical device used to raise and (temporarily) support a heavy object, e.g. screw jack, scissor jack, hydraulic jack, ratchet jack, scaffold jack.
A system of gearing driven by a horse power, for multiplying speed.
A hood or other device placed over a chimney or vent pipe, to prevent a back draught.
In the harpsichord, an intermediate piece communicating the action of the key to the quill; also called hopper.
In hunting, the pan or frame holding the fuel of the torch used to attract game at night; also, the light itself.
(nautical) A bar of iron athwart ships at a topgallant masthead, to support a royal mast, and give spread to the royal shrouds; also called jack crosstree.
Female ended electrical connector (see Electrical connector)
Electrical connector in a fixed position (see Gender of connectors and fasteners)
“Navy ships not under way also hoist and lower the union jack on the jackstaff, at the ship's bow, and at morning and evening colors.”
“Navy ships not underway fly the union jack on the jackstaff. The union jack is also flown from a yardarm to denote that a general court-martial is in session.”
“When at anchor or alongside, it is flown from the jackstaff at the bow of the ship.”
“Freezing doe eyes with a jacklight from a chalky bed, chalk of deep woods volcanoes, with a boy or two.”
“The Jacklight from designer Tom Dixon is always popular and is an unusual corner ornament.”
“The mix of iconic pieces, such as our Stark stools or Tom Dixon Jacklight, with our vintage sideboard and retro chairs suits our house and our life perfectly.”
jackstone
A jack; one of the playing pieces in the game of jacks.
“In that instant, she looked at the jackstone players by the hearth.”
“Four APV Jackstone plate freezers, complimented with Mycom compressors, are capable of turning out 30 to 40 tons of finished product per day.”
“Jackstone offers a broad range of vertical and horizontal plate freezers, and recently made stainless steel headers and plate connectors standard on both types.”
jacker
(archaic) One who hunts at night using a jacklight