bamboo vs graminaceous plant

bamboo and graminaceous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
bamboo	Yes	No	No	No
graminaceous plant	Yes	No	No	No

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

bamboo: woody tropical grass having hollow woody stems; mature canes used for construction and furniture
graminaceous plant: cosmopolitan herbaceous or woody plants with hollow jointed stems and long narrow leaves

Other hypernyms of bamboo include gramineous plant.

bamboo (noun)	graminaceous plant (noun)
woody tropical grass having hollow woody stems; mature canes used for construction and furniture	cosmopolitan herbaceous or woody plants with hollow jointed stems and long narrow leaves
the hard woody stems of bamboo plants; used in construction and crafts and fishing poles