locust bean vs carob powder

locust bean and carob powder both are nouns.

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

locust bean (noun)	carob powder (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