carob bean vs locust bean

carob bean and locust bean both are nouns.

Word	Noun	Adjective	Verb	Adverb
carob bean	Yes	No	No	No
locust bean	Yes	No	No	No

As nouns, carob bean and locust bean are synonyms defined as:

carob bean and locust bean: long pod containing small beans and sweetish edible pulp; used as animal feed and source of a chocolate substitute

Other synonyms of carob bean include algarroba, algarroba bean, carob, locust pod.

carob bean (noun)	locust bean (noun)
long pod containing small beans and sweetish edible pulp; used as animal feed and source of a chocolate substitute	long pod containing small beans and sweetish edible pulp; used as animal feed and source of a chocolate substitute