sickbay vs sick berth

sickbay and sick berth both are nouns.

Word	Noun	Adjective	Verb	Adverb
sickbay	Yes	No	No	No
sick berth	Yes	No	No	No

As nouns, sickbay and sick berth are synonyms defined as:

sickbay and sick berth: (nautical) a room for the treatment of the sick or injured (as on a ship)

sickbay (noun)	sick berth (noun)
(nautical) a room for the treatment of the sick or injured (as on a ship)	(nautical) a room for the treatment of the sick or injured (as on a ship)