| AMBERJACKS | • amberjacks n. Plural of amberjack. • AMBERJACK n. a large Atlantic gamefish having golden markings when young. |
| JAMBUSTERS | • jambusters n. Plural of jambuster. • JAMBUSTER n. (Canadian) a jelly-filled doughnut. |
| JETSTREAMS | • jetstreams n. Plural of jetstream. • jet␣streams n. Plural of jet stream. • JETSTREAM n. a narrow belt of high-altitude winds moving east at high speeds and having an important effect on frontogenesis. |
| JIGAMAREES | • jigamarees n. Plural of jigamaree. • JIGAMAREE n. a whatsit. |
| JIGGERMAST | • jiggermast n. (Nautical) The fourth-tallest mast on a ship with more than three masts; particularly a full-rigged ship. • jigger-mast n. Alternative spelling of jiggermast. • jigger␣mast n. Alternative spelling of jiggermast. |
| JUMPMASTER | • jumpmaster n. One who supervises the jumping of paratroopers or other parachutists from an aeroplane. |
| JUNKERDOMS | • JUNKERDOM n. the office of junker. |
| MAJORETTES | • majorettes n. Plural of majorette. • MAJORETTE n. a member of a group of girls who march in parades etc. |
| MAJORITIES | • majorities n. Plural of majority. • MAJORITY n. the greater number. |
| MISJOINDER | • misjoinder n. (Law) An incorrect union of parties or of causes of action in a procedure in court. • MISJOINDER n. an incorrect union of parties or of causes of action in a procedure, criminal or civil. |
| MISJUDGERS | • misjudgers n. Plural of misjudger. • MISJUDGER n. one who misjudges. |
| SHOWJUMPER | • showjumper n. Alternative spelling of show jumper. • show␣jumper n. (Equestrianism) A (human or horse) participant in show jumping. • SHOWJUMPER n. a horse or rider in a showjumping competition. |
| SKIJUMPERS | • ski␣jumpers n. Plural of ski jumper. • SKIJUMPER n. one who engages in the sport of ski-jumping. |
| SUPERJUMBO | • superjumbo n. The largest passenger airliner, the Airbus A380. • SUPERJUMBO n. a very large airliner. |