digitalis vs cardiac glycoside

digitalis and cardiac glycoside both are nouns.

Word	Noun	Adjective	Verb	Adverb
digitalis	Yes	No	No	No
cardiac glycoside	Yes	No	No	No

As nouns, cardiac glycoside is a hypernym of digitalis; that is, cardiac glycoside is a word with a broader meaning than digitalis:

digitalis: a powerful cardiac stimulant obtained from foxglove
cardiac glycoside: obtained from a number of plants and used to stimulate the heart in cases of heart failure

Other hypernyms of digitalis include cardiac glucoside.

digitalis (noun)	cardiac glycoside (noun)
any of several plants of the genus Digitalis	obtained from a number of plants and used to stimulate the heart in cases of heart failure
a powerful cardiac stimulant obtained from foxglove