- Jab in
- Jabbering
- Jack timber
- Jack tree
- Jackboot
- Jacket
- Jackfruit
- Jacks
- Jag
- Jailbreak
- Jamb
- Janaka
- January
- Janus-faced
- Japan
- Jasmine flower
- Jasmine plant
- Jaundice
- Jauntily
- Jauntiness
- Jaunty
- Java
- Jaw dropping
- Jcb
- Jcc
- Jealousy
- Jean
- Jeep
- Jehovah
- Jellied
- Jeopardise
- Jeopardize
- Jerry-building
- Jerry-built
- Jersey
- Jerusalem
- Jesus
- Jet black
- Jeweler
- Jewelled
- Jeweller
- Jewellery
- Jewelry
- Jewish colony
- Jib
- Jibber
- Jiffy bag
- Jig is up
- Jihad
- Jingling ornament for the leg
- Job batch
- Job creation
- Job satisfaction
- Job sharing
- Job title
- Jocundity
- Jog trot
- Joggle
- John bull
- Johnny-come-lately
- Join
- Join forces with
- Jointly
- Joke
- Joking
- Jolliness
- Jonesia asoca
- Josh
- Joss stick
- Jostle
- Journal
- Journalese
- Journalistic
- Journeyman
- Jowl
- Joyfully
- Joyfulness
- Joyous
- Joyride
- Judder
- Judge
- Judgement day
- Judicature
- Judiciously
- Judo
- Juggle
- Juggling
- Juice
- Juicy
- Julienne
- Jumbled
- Jumbo
- Jump
- Jump out of
- Jump the queue
- Jump to
- Jump up and down
- Jump-start
- Jumper
- Junctor