| CRACKJAWS | • CRACKJAW n. a word which is hard to pronounce. |
| CROSSJACK | • crossjack n. (Nautical) On a mizzenmast, the lowest square sail. • CROSSJACK n. a square sail set on the mizzenmast. |
| FORJASKIT | • FORJASKIT adj. (Scots) tired out, also DISJASKIT, FORJESKIT. |
| HIJACKERS | • hijackers n. Plural of hijacker. • HIJACKER n. one that hijacks, also HIGHJACKER. |
| JACKAROOS | • jackaroos n. Plural of jackaroo. • JACKAROO n. (Australian) a newcomer gaining experience at a sheep-station. |
| JACKEROOS | • jackeroos n. Plural of jackeroo. • JACKEROO n. (Australian) a newcomer gaining experience at a sheep-station. |
| JACKROLLS | • jackrolls v. Third-person singular simple present indicative form of jackroll. • JACKROLL v. (South African) to roll a drunken or sleeping person. |
| JACKSCREW | • jackscrew n. A jack (mechanical lifting device) which is operated by turning a leadscrew. • jackscrew n. A leadscrew; a screw used to translate rotational into linear motion. • jack␣screw n. Alternative form of jackscrew. |
| JACKSTRAW | • jackstraw n. (Usually plural) One of the pieces used for the game called jackstraws or pick-up sticks. • jackstraw n. (Dated) An insignificant person. • jackstraw adj. Resembling a bundle of jackstraws that has been strewn on a surface. |
| JAKFRUITS | • jakfruits n. Plural of jakfruit. • JAKFRUIT n. an East Indian tree of the breadfruit family, also JACKFRUIT, JAK. |
| JARARAKAS | • jararakas n. Plural of jararaka. • JARARAKA n. (Tupi) a South American venomous snake, also JARARACA. |
| JIMCRACKS | • jimcracks n. Plural of jimcrack. • JIMCRACK n. something cheap and showy, of little use, also GIMCRACK. |
| JINRIKSHA | • jinriksha n. Synonym of rickshaw. • JINRIKSHA n. (Japanese) a small, two-wheeled hooded carriage drawn by a man or men, also JINRICKSHA, JINRICKSHAW, JINRIKISHA, RICKSHA, RICKSHAW, RIKISHA, RIKSHAW. |
| JOCKSTRAP | • jockstrap n. (Sports) An athletic supporter worn by men and boys to support the genitals during strenuous exercise. • jock␣strap n. Alternative form of jockstrap. • JOCKSTRAP n. a genital support worn esp. by men participating in athletics. |
| JUNKYARDS | • junkyards n. Plural of junkyard. • JUNKYARD n. a yard where junk is stored. |
| REJACKETS | • rejackets v. Third-person singular simple present indicative form of rejacket. • REJACKET v. to clothe in a jacket once more. |
| SKYJACKER | • skyjacker n. A person who commits skyjacking, who skyjacks. • SKYJACKER n. one who skyjacks, hijacks an aeroplane. |