red devil vs barbiturate

red devil and barbiturate both are nouns.

Word	Noun	Adjective	Verb	Adverb
red devil	Yes	No	No	No
barbiturate	Yes	No	No	No

As nouns, barbiturate is a hypernym of red devil; that is, barbiturate is a word with a broader meaning than red devil:

red devil: barbiturate that is a white odorless slightly bitter powder (trade name Seconal) used as a sodium salt for sedation and to treat convulsions
barbiturate: organic compound having powerful soporific effect; overdose can be fatal

red devil (noun)	barbiturate (noun)
barbiturate that is a white odorless slightly bitter powder (trade name Seconal) used as a sodium salt for sedation and to treat convulsions	organic compound having powerful soporific effect; overdose can be fatal