carob bean tree vs bean tree

carob bean tree and bean tree both are nouns.

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

As nouns, bean tree is a hypernym of carob bean tree; that is, bean tree is a word with a broader meaning than carob bean tree:

carob bean tree: evergreen Mediterranean tree with edible pods; the biblical carob
bean tree: any of several trees having seedpods as fruits

carob bean tree (noun)	bean tree (noun)
evergreen Mediterranean tree with edible pods; the biblical carob	any of several trees having seedpods as fruits