carob vs carob tree

carob and carob tree both are nouns.

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

As nouns, carob and carob tree are synonyms defined as:

carob and carob tree: evergreen Mediterranean tree with edible pods; the biblical carob

Other synonyms of carob include algarroba, carob bean tree, Ceratonia siliqua.

carob (noun)	carob tree (noun)
powder from the ground seeds and pods of the carob tree; used as a chocolate substitute	evergreen Mediterranean tree with edible pods; the biblical carob
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