gallberry vs holly

gallberry and holly both are nouns.

Word	Noun	Adjective	Verb	Adverb
gallberry	Yes	No	No	No
holly	Yes	No	No	No

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

gallberry: evergreen holly of eastern North America with oblong leathery leaves and small black berries
holly: any tree or shrub of the genus Ilex having red berries and shiny evergreen leaves with prickly edges

gallberry (noun)	holly (noun)
evergreen holly of eastern North America with oblong leathery leaves and small black berries	any tree or shrub of the genus Ilex having red berries and shiny evergreen leaves with prickly edges