ject = throw
project
projected
projectile
ile ->(n)something
projecting
ing-> adj
projection
projector
jut
inject
injection
object
ob=op(opposite)
UFO
Unidentified Flying Object
objection
objectionable
objective
objectively
objectivity
subject
subjective
reject
rejection
trajectory
abject
adjacent
adjective
conjecture
eject
interject
jet
jetliner
jettison
ease
gist
ju-, jur-, just-, jus, jud = law, right, 司法，公平，正义，审判
just
justly
unjust
justice
injustice
justify
justified
justification
justifiable
justifiably
jury
perjury
per- = away + jury
jurist
jur- = jury + ist