carob bean vs Saint-John's-bread

carob bean and Saint-John's-bread both are nouns.

Word	Noun	Adjective	Verb	Adverb
carob bean	Yes	No	No	No
Saint-John's-bread	Yes	No	No	No

carob bean (noun)	Saint-John's-bread (noun)
long pod containing small beans and sweetish edible pulp; used as animal feed and source of a chocolate substitute	powder from the ground seeds and pods of the carob tree; used as a chocolate substitute