cargo area vs enclosure

cargo area and enclosure both are nouns.

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

As nouns, enclosure is a hypernym of cargo area; that is, enclosure is a word with a broader meaning than cargo area:

cargo area: the space in a ship or aircraft for storing cargo
enclosure: a structure consisting of an area that has been enclosed for some purpose

cargo area (noun)	enclosure (noun)
the space in a ship or aircraft for storing cargo	the act of enclosing something inside something else
	a structure consisting of an area that has been enclosed for some purpose
	something (usually a supporting document) that is enclosed in an envelope with a covering letter
	a naturally enclosed space