cousin-german vs full cousin

cousin-german and full cousin both are nouns.

Word	Noun	Adjective	Verb	Adverb
cousin-german	Yes	No	No	No
full cousin	Yes	No	No	No

As nouns, cousin-german and full cousin are synonyms defined as:

Other synonyms of cousin-german include cousin, first cousin.

cousin-german (noun)	full cousin (noun)
the child of your aunt or uncle	the child of your aunt or uncle