| J (letter) | n | Jod |
| Jack of clubs | n | Pam |
| Jack Snipe | n | Gaverhale, Judcock |
| Jackdaw | n | Chauk, Chough, Daw |
| Jacket, short | n | Kittle |
| Jam roly-poly | n | Bolster-pudding |
| Jamb | n | Durn, Jump |
| Jangle (bell) | v | Jamble |
| Jar, small earthen | n | Nan |
| Jaw | n | Muzzle |
| Jeer | v | Fleer, Frump |
| Jelly | n | Gide |
| Jellyfish | n | Blovers |
| Jerk | v | Flirt, Twick |
| Jerk hand when playing marbles | v | Fullock |
| Jerkily | adv | Ickitty-Pickitty |
| Jerusalem cowslip | n | Lungwort |
| Jessamine | n | Jessamy |
| Jesus (minced oath) | int | Jay |
| Jiffy | n | Giffin, Jiff |
| Jiminy | int | Jimmery |
| Jingle | v | Ting |
| Job | n | Feat |
| Jog | v | Tog |
| Join iron without welding | v | Butt-Shut |
| Joint | n | Wherve |
| Joist | n | Piggin |
| Joke, practical | n | May-Game |
| Jokey | adj | Jokesy |
| Jolly | adj | Buxom, Crummy |
| Jolt | v | Jot, Julk |
| Jostle | v | Joss, Yessle |
| Joyful | adj | Blissom, Joysome |
| Judgement | n | Censure, Dooming |
| Jug without handle | n | Hoster |
| Jug, small | n | Pifkin |
| Juice | n | Duce |
| Jumble | v | Mix-medley, Momble |
| Jump | v | Hoppy |
| Jump (of fish) | v | Sport |
| Jump over | v | Brish over |
| Juvenile | n | Junival |