As adjectives the difference between shipboard and onboard
is that shipboard is occurring or existing on board a ship while onboard is carried or used on or in a vehicle or vessel.
As a noun shipboard
is the side of a ship.
As an adverb onboard is
on or in a vehicle or vessel; aboard; on board.
shipboard
English
Adjective
(-)
(nautical) Occurring or existing on board a ship.
onboard
English
Adjective
(-)
Carried or used on or in a vehicle or vessel
Adverb
(-)
On or in a vehicle or vessel; aboard; on board.
Related terms
* outboard
* aboard