If you are asking for language names:
Japanese
Jaquela
Jatapu
Javanese
Jawi
Jèrriais (Jersey Norman French)
Jingbu, Jtaszdasoten
Judeo-Arabic
Judeo-Spanish
Juǀʼhoan
Juhuri
Jurchen
If you are asking for grammatical terms:
(There are none)
Japanese
If you are looking for a native tree that starts with J , there is no J in the Maori language.
Noun
There is no J in the Hebrew language, except in modern, borrowed words.
a jamprenia is an endangered bird
Sorry, friend. Ukrainian language uses the Cyrillic alphabet, in which there is no J.
Joint and Juvenile Gas
· Jordan River (Israel, Jordan)
Debate Dissuasive speech
There are no geometry terms that start with the letter J. Geometry deals with the spatial relationships of objects.
There are hundreds of words that start with the letter j. There are less than 10 words in the English language that end with the letter j. There are no words that begin and end with the letter j.
"Jet stream" is a weather term that starts with the letter J. It refers to narrow bands of strong wind in the atmosphere that can influence weather patterns.