| Word/Phrase | Definition | Useage |
| J.P. | Justice of the Peace | Scot.Occup |
| Jack | 1) Sailor 2) young male assistant.. | UK Occupation |
| Jack-frame Tenter | A Jack-frame was a complicated machine that twisted textile threads and wound it onto bobbins. 'Tenting' meant attending / watching | UK Occupation |
| Jackman | Attendant or man-at-arms, for a nobleman or landowner | Scot.Occup |
| Jack-smith | Made lifting machinery / equipment | UK Occupation |
| jägare | hunter | Swedish |
| Jagger | 1) Fish peddler 2) 19c. Boy in charge of 'jags' or truck trains in a coal mine 3) Man attending pack-horses carrying iron ore to the smelter 4) 20c. Uniformed messenger for London businesses | UK Occupation |
| jägmästare | forester | Swedish |
| Jail fever | Typhus | Medical |
| Jakes Farmer | Cesspool emptier | UK Occupation |
| jämte | together with | Swedish |
| Januar | January | Germany |
| januari | January | Swedish |
| janvier | January | French |
| Japanner | Applied Japanese style black hard varnish - 'Japanning' | UK Occupation |
| Jaundice | Condition caused by blockage of intestines. Yellowing of the skin caused by too many red blood cells dying. | Medical |
| Javelin Man | Attendant at court who carried a spear or pike | UK Occupation |
| Jenny/ Jenney / Ginny Tenter | Minded a Ginny - a stationary engine used in coal mining to haul coal to the surface | UK Occupation |
| Jerquer | Customs Officer - shipping. Issued 'Jerque Note' for clearance of vessel | UK Occupation |
| Jersey Comber | Employed combing Jersey wool before spinning | UK Occupation |
| Job Coachman | Drove a coach hired to nobility or gentry for long periods | UK Occupation |
| Jobber | 1) Dealer in goods 2) Pieceworker - paid by the job 3) In a cotton mill, a Jobber was also known as a Tackler, who maintained machinery | UK Occupation |
| Jobbing man | Employed for a variety of small jobs or tasks | Scot.Occup |
| Jobmaster | Supplied horses, carriages and drivers for hire | UK Occupation |
| Joiner | A wood worker, a carpenter | Scot.Occup |
| Jollier | See Potter's Jollier | UK Occupation |
| Jongleur | Travelling minstrel | UK Occupation |
| jord | earth, soil, land | Swedish |
| jordbrukare | farmer | Swedish |
| jordebok | land record | Swedish |
| jordegumma | midwife | Swedish |
| jordfästning | funeral, burial service | Swedish |
| Journeyman | A tradesman who has served his trade apprenticeship and mastered his craft, not bound to serve a master, but originally hired by the day. The name derives from the French for day - jour. Also Engineer Journeyman. More Info. | UK Occupation |
| Jouster | Fishmonger. Female hawker of fish | UK Occupation |
| Jowter | Mounted pedlar of fish | UK Occupation |
| Joyner / Joiner | A skilled carpenter, capable of finer work than a plain carpenter. i.e. skilled in making joints for furniture-making. The term is still very much in common usage. | UK Occupation |
| jude | Jew | Swedish |
| judisk | Jewish | Swedish |
| juillet | July | French |
| juin | June | French |
| jul | Christmas | Swedish |
| Juli | July | Germany/Swedish |
| julio | July | Spanish |
| jungfru | Miss, maiden, virgin | Swedish |
| Juni | June | Germany/Swedish |
| junio | June | Spanish |
| Justiciar | Head of the royal judiciary and king's viceroy in his absence abroad | UK Occupation |
| Jute winder | Jute mill worker who wound the thread on weaving looms . | Scot.Occup |
| Juvellour | A Jeweller | UK Occupation |