robber frog vs batrachian

robber frog and batrachian both are nouns.

Word	Noun	Adjective	Verb	Adverb
robber frog	Yes	No	No	No
batrachian	Yes	Yes	No	No

As nouns, batrachian is a hypernym of robber frog; that is, batrachian is a word with a broader meaning than robber frog:

robber frog: small terrestrial frog of tropical America
batrachian: any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species

Other hypernyms of robber frog include anuran, frog, salientian, toad, toad frog.

As nouns, batrachian is a hypernym of robber frog; that is, batrachian is a word with a broader meaning than robber frog:

robber frog: of southwest United States and Mexico; call is like a dog's bark
batrachian: any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species

Other hypernyms of robber frog include anuran, frog, salientian, toad, toad frog.

robber frog (noun)	batrachian (noun)
small terrestrial frog of tropical America	any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species
of southwest United States and Mexico; call is like a dog's bark

robber frog (adjective)	batrachian (adjective)
	relating to frogs and toads