Here are some possible words:
jabs
jack
jade
jags
jail
Jake
jamb
jams
Jane
jape
jars
jato
java
jaws
jays
jazz
jean
jeer
jeez
jefe
jell
jerk
jess
jest
jets
jeux
Jews
jibe
jibs
jiff
jigs
Jill
jilt
jinn
jins
jinx
jive
jobs
jock
joes
joey
jogs
john
joie
join
joke
jolt
Jose
josh
joss
jota
jots
jour
jowl
joys
juan
judo
judy
jugs
juju
juke
July
jump
June
junk
juno
jupe
jure
jury
just
jute
juts
jibe
Some four letter J words are:jackjadejailJakejapejazzjeerjerkjestjiltJilljinxjivejoeyjohnjoinjokejoshjudojumpjunkjuryjustjute
A four letter word that starts with J and ends with M: jism.
A four letter word starting with J is jump or joke.
jump.
Hadj
Some four letter words that start with J are:jokeJunejustjuryjailJoveJerkjumpjestjeerjunkjive
ajar mojo
Jerk
jackjailjerkjiltjokejoinjoltjumpjustjunk
jest
jolt just jump
Fuji