Bamboo and Giant bamboo

Bamboo noun - Woody tropical grass having hollow woody stems; mature canes used for construction and furniture.

Giant bamboo and bamboo are semantically related. In some cases you can replace phrase "Giant bamboo" with "Bamboo", this terms are similar.

Giant bamboo noun - Immense tropical southeast Asian bamboo with tough hollow culms that resemble tree trunks.

Bamboo and giant bamboo are semantically related. You can use "Bamboo" instead a noun phrase "Giant bamboo".