Quercus agrifolia vs live oak

Quercus agrifolia and live oak both are nouns.

Word	Noun	Adjective	Verb	Adverb
Quercus agrifolia	Yes	No	No	No
live oak	Yes	No	No	No

As nouns, live oak is a hypernym of Quercus agrifolia; that is, live oak is a word with a broader meaning than Quercus agrifolia:

Quercus agrifolia: highly variable often shrubby evergreen oak of coastal zone of western North America having small thick usually spiny-toothed dark-green leaves
live oak: any of several American evergreen oaks

Quercus agrifolia (noun)	live oak (noun)
highly variable often shrubby evergreen oak of coastal zone of western North America having small thick usually spiny-toothed dark-green leaves	any of several American evergreen oaks