curtilage vs backyard

curtilage and backyard both are nouns.

Word	Noun	Adjective	Verb	Adverb
curtilage	Yes	No	No	No
backyard	Yes	No	No	No

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

Other hyponyms of curtilage include dooryard, front yard, garden, playground, side yard.

curtilage (noun)	backyard (noun)
the enclosed land around a house or other building	the grounds in back of a house