Ilex decidua vs holly

Ilex decidua and holly both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ilex decidua	Yes	No	No	No
holly	Yes	No	No	No

As nouns, holly is a hypernym of Ilex decidua; that is, holly is a word with a broader meaning than Ilex decidua:

Ilex decidua: deciduous shrub of southeastern and central United States
holly: any tree or shrub of the genus Ilex having red berries and shiny evergreen leaves with prickly edges

Ilex decidua (noun)	holly (noun)
deciduous shrub of southeastern and central United States	any tree or shrub of the genus Ilex having red berries and shiny evergreen leaves with prickly edges