adobe brick vs adobe

adobe brick and adobe both are nouns.

Word	Noun	Adjective	Verb	Adverb
adobe brick	Yes	No	No	No
adobe	Yes	No	No	No

As nouns, adobe brick and adobe are synonyms defined as:

adobe brick (noun)	adobe (noun)
sun-dried brick; used in hot dry climates	sun-dried brick; used in hot dry climates
	the clay from which adobe bricks are made