locust bean vs carob bean

locust bean and carob bean both are nouns.

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

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

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

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

locust bean (noun)	carob 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