flight deck vs landing deck

flight deck and landing deck both are nouns.

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

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

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

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