carob bean tree vs algarroba bean

carob bean tree and algarroba bean both are nouns.

Word	Noun	Adjective	Verb	Adverb
carob bean tree	Yes	No	No	No
algarroba bean	Yes	No	No	No

carob bean tree (noun)	algarroba bean (noun)
evergreen Mediterranean tree with edible pods; the biblical carob	long pod containing small beans and sweetish edible pulp; used as animal feed and source of a chocolate substitute