gosan-chiku vs bamboo

gosan-chiku and bamboo both are nouns.

Word	Noun	Adjective	Verb	Adverb
gosan-chiku	Yes	No	No	No
bamboo	Yes	No	No	No

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

gosan-chiku: small bamboo of southeastern China having slender culms flexuous when young
bamboo: woody tropical grass having hollow woody stems; mature canes used for construction and furniture

gosan-chiku (noun)	bamboo (noun)
small bamboo of southeastern China having slender culms flexuous when young	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