cargo area vs cargo deck

cargo area and cargo deck both are nouns.

Word	Noun	Adjective	Verb	Adverb
cargo area	Yes	No	No	No
cargo deck	Yes	No	No	No

As nouns, cargo area and cargo deck are synonyms defined as:

cargo area and cargo deck: the space in a ship or aircraft for storing cargo

Other synonyms of cargo area include cargo hold, hold, storage area.

cargo area (noun)	cargo deck (noun)
the space in a ship or aircraft for storing cargo	the space in a ship or aircraft for storing cargo