kitchen vs galley

kitchen and galley both are nouns.

Word	Noun	Adjective	Verb	Adverb
kitchen	Yes	No	No	No
galley	Yes	No	No	No

As nouns, galley is a hyponym of kitchen; that is, galley is a word with a more specific, narrower meaning than kitchen:

Other hyponyms of kitchen include caboose, cookhouse, ship's galley, kitchenette.

kitchen (noun)	galley (noun)
a room equipped for preparing meals	the area for food preparation on a ship
	the kitchen area for food preparation on an airliner
	(classical antiquity) a crescent-shaped seagoing vessel propelled by oars
	a large medieval vessel with a single deck propelled by sails and oars with guns at stern and prow; a complement of 1,000 men; used mainly in the Mediterranean for war and trading