a general word. It is a noun and a verb. We never say 'a travel'.
It is an uncountable noun.
A trip is shorter than a journey.
If you go on a trip, it suggests it is an organised short
excursion, whereas if you take / have a trip it could be
something you do yourselves in your own car.
Voyage means a long journey usually
by sea, though this use is quite formal
A flight is a long journey by air.