diethylmalonylurea vs barbital

diethylmalonylurea and barbital both are nouns.

Word	Noun	Adjective	Verb	Adverb
diethylmalonylurea	Yes	No	No	No
barbital	Yes	No	No	No

As nouns, diethylmalonylurea and barbital are synonyms defined as:

Other synonyms of diethylmalonylurea include barbitone, diethylbarbituric acid, veronal.

diethylmalonylurea (noun)	barbital (noun)
a barbiturate used as a hypnotic	a barbiturate used as a hypnotic