Hydrangea anomala vs hydrangea

Hydrangea anomala and hydrangea both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hydrangea anomala	Yes	No	No	No
hydrangea	Yes	No	No	No

As nouns, hydrangea is a hypernym of Hydrangea anomala; that is, hydrangea is a word with a broader meaning than Hydrangea anomala:

Hydrangea anomala: deciduous climber with aerial roots having white to creamy flowers in fairly flat heads
hydrangea: any of various deciduous or evergreen shrubs of the genus Hydrangea

Hydrangea anomala (noun)	hydrangea (noun)
deciduous climber with aerial roots having white to creamy flowers in fairly flat heads	any of various deciduous or evergreen shrubs of the genus Hydrangea