Quercus ilicifolia vs scrub oak

Quercus ilicifolia and scrub oak both are nouns.

Word	Noun	Adjective	Verb	Adverb
Quercus ilicifolia	Yes	No	No	No
scrub oak	Yes	No	No	No

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

Quercus ilicifolia: shrubby oak of southeastern United States usually forming dense thickets
scrub oak: any of various chiefly American small shrubby oaks often a dominant form on thin dry soils sometimes forming dense thickets

Quercus ilicifolia (noun)	scrub oak (noun)
shrubby oak of southeastern United States usually forming dense thickets	any of various chiefly American small shrubby oaks often a dominant form on thin dry soils sometimes forming dense thickets