Why “arkship” is a great word
A large vessel designed to transport the surviving members of a species or civilization away from a planetary catastrophe to ensure their survival. Formed from 'ark' (from the concept of Noah's Ark, a vessel of preservation) and 'ship' (a large seagoing or spacefaring vessel). Unlike a generation ship, which presupposes a voyage so long its purpose is fulfilled by the crew’s descendants, or a colony ship, which carries settlers in a planned act of expansion, an arkship is defined by its desperate, exodial purpose: immediate evacuation from an existential end. It is the last cultivated seed vault flung into the void, the cryogenic chambers humming with suspended lives, and the navigation computer locked onto a distant, uncertain star—the fragile, monumental argument against absolute silence.
Definitions & examples from Wiktionary (CC BY-SA 3.0).