scrub oak vs bear oak

scrub oak and bear oak both are nouns.

Word	Noun	Adjective	Verb	Adverb
scrub oak	Yes	No	No	No
bear oak	Yes	No	No	No

As nouns, bear oak is a hyponym of scrub oak; that is, bear oak is a word with a more specific, narrower meaning than scrub oak:

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

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