Hyla regilla vs tree frog

Hyla regilla and tree frog both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hyla regilla	Yes	No	No	No
tree frog	Yes	No	No	No

As nouns, tree frog is a hypernym of Hyla regilla; that is, tree frog is a word with a broader meaning than Hyla regilla:

Hyla regilla: the most commonly heard frog on the Pacific coast of America
tree frog: arboreal amphibians usually having adhesive disks at the tip of each toe; of southeast Asia and Australia and America

Other hypernyms of Hyla regilla include tree-frog, tree toad.

Hyla regilla (noun)	tree frog (noun)
the most commonly heard frog on the Pacific coast of America	any of various Old World arboreal frogs distinguished from true frogs by adhesive suckers on the toes
	arboreal amphibians usually having adhesive disks at the tip of each toe; of southeast Asia and Australia and America