| JACKASSERY | • jackassery n. The foolish or obnoxious behaviour of a jackass. • JACKASSERY n. being a jackass. |
| JACKETLESS | • jacketless adj. Without a jacket (coat). • jacketless adj. Without a jacket (book cover). • JACKETLESS adj. without a jacket. |
| JACKFISHES | • jackfishes n. Plural of jackfish. • JACKFISH n. a food fish. |
| JACKSCREWS | • jackscrews n. Plural of jackscrew. • jack␣screws n. Plural of jack screw. • JACKSCREW n. a jack in which a screw is used for lifting, or exerting pressure. |
| JACKSMELTS | • jacksmelts n. Plural of jacksmelt. • JACKSMELT n. a large fish of the Pacific coast of North America. |
| JACKSNIPES | • jacksnipes n. Plural of jacksnipe. • JACKSNIPE n. a kind of snipe. |
| JACKSTAVES | • jackstaves n. Plural of jackstaff. • JACKSTAFF n. a short staff at a ship's bow, on which a jack is hoisted. |
| JACKSTONES | • jackstones n. Plural of jackstone. • JACKSTONE n. a piece used in the game of jacks. |
| JOBSEEKERS | • jobseekers n. Plural of jobseeker. • JOBSEEKER n. one engaged in seeking employment. |
| JOCKEYISMS | • jockeyisms n. Plural of jockeyism. • JOCKEYISM n. the practice of jockeys. |
| JOKESMITHS | • jokesmiths n. Plural of jokesmith. • JOKESMITH n. (archaic) a composer of jokes. |
| JOKINESSES | • JOKINESS n. the state of being amusing. |
| SKIJUMPERS | • ski␣jumpers n. Plural of ski jumper. • SKIJUMPER n. one who engages in the sport of ski-jumping. |
| SKIKJORERS | • SKIKJORER n. one who engages in the sport of skijoring, also SKIJORER, SKIORER. |
| SKYJACKERS | • skyjackers n. Plural of skyjacker. • SKYJACKER n. one who skyjacks, hijacks an aeroplane. |
| SMOKEJACKS | • smokejacks n. Plural of smokejack. • smoke␣jacks n. Plural of smoke jack. • SMOKEJACK n. a contrivance for turning a spit by means of a fly or wheel moved by the current of ascending air in a chimney. |
| SUPERJOCKS | • superjocks n. Plural of superjock. • SUPERJOCK n. a very good athlete. |