American toad vs true toad

American toad and true toad both are nouns.

Word	Noun	Adjective	Verb	Adverb
American toad	Yes	No	No	No
true toad	Yes	No	No	No

As nouns, true toad is a hypernym of American toad; that is, true toad is a word with a broader meaning than American toad:

American toad: common toad of America
true toad: tailless amphibian similar to a frog but more terrestrial and having drier warty skin

American toad (noun)	true toad (noun)
common toad of America	tailless amphibian similar to a frog but more terrestrial and having drier warty skin