Jackstay :: "Jackstay (n.) A rail of wood or iron stretching along a yard of a vessel, to which the sails are fastened..
Jackstone :: Jackstone (n.) One of the pebbles or pieces used in the game of jackstones.
Jackstone :: Jackstone (n.) A game played with five small stones or pieces of metal. See 6th Chuck.
Jackstraw :: "Jackstraw (n.) An effigy stuffed with straw; a scarecrow; hence, a man without property or influence..
Jackstraw :: "Jackstraw (n.) One of a set of straws of strips of ivory, bone, wood, etc., for playing a child's game, the jackstraws being thrown confusedly together on a table, to be gathered up singly by a hooked instrument, without touching or disturbing the rest of the pile. See Spilikin..