Nouns

(n)jack, doodly-squat, diddly-squat, diddlysquat, diddly-shit, diddlyshit, diddly, diddley, squat, shita small worthless amount“you don't know jack”
(n)laborer, manual laborer, labourer, jacksomeone who works with their hands; someone engaged in manual labor
(n)jackfruit, jak, jackimmense East Indian fruit resembling breadfruit; it contains an edible pulp and nutritious seeds that are commonly roasted
(n)jacka small ball at which players aim in lawn bowling
(n)jackan electrical device consisting of a connector socket designed for the insertion of a plug
(n)jack, jackstonesgame equipment consisting of one of several small six-pointed metal pieces that are picked up while bouncing a ball in the game of jacks
(n)jacksmall flag indicating a ship's nationality
(n)jack, knaveone of four face cards in a deck bearing a picture of a young prince
(n)jacktool for exerting pressure or lifting
(n)jackany of several fast-swimming predacious fishes of tropical to warm temperate seas
(n)jack, jackassmale donkey

Verbs

(v)jack, jack uplift with a special device“jack up the car so you can change the tire”
(v)jacklight, jackhunt with a jacklight