black bamboo vs bamboo

black bamboo and bamboo both are nouns.

Word	Noun	Adjective	Verb	Adverb
black bamboo	Yes	No	No	No
bamboo	Yes	No	No	No

As nouns, bamboo is a hypernym of black bamboo; that is, bamboo is a word with a broader meaning than black bamboo:

black bamboo: small bamboo having thin green culms turning shining black
bamboo: woody tropical grass having hollow woody stems; mature canes used for construction and furniture

black bamboo (noun)	bamboo (noun)
small bamboo having thin green culms turning shining black	woody tropical grass having hollow woody stems; mature canes used for construction and furniture
	the hard woody stems of bamboo plants; used in construction and crafts and fishing poles