- 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
- Jungle roamer
- Jungle-dwellers
- Junior
- Juniper
- Juniper berry
- Jurists
- Just one of these things
- Jute
- Jute-twine
- Juvenile court
- Juvenile delinquent
- John