landing deck vs flight deck

landing deck and flight deck both are nouns.

Word	Noun	Adjective	Verb	Adverb
landing deck	Yes	No	No	No
flight deck	Yes	No	No	No

As nouns, landing deck and flight deck are synonyms defined as:

landing deck and flight deck: the upper deck of an aircraft carrier; used as a runway

landing deck (noun)	flight deck (noun)
the upper deck of an aircraft carrier; used as a runway	the upper deck of an aircraft carrier; used as a runway