barbituric acid vs malonylurea

barbituric acid and malonylurea both are nouns.

Word	Noun	Adjective	Verb	Adverb
barbituric acid	Yes	No	No	No
malonylurea	Yes	No	No	No

As nouns, barbituric acid and malonylurea are synonyms defined as:

barbituric acid and malonylurea: a white crystalline acid derived from pyrimidine; used in preparing barbiturate drugs

barbituric acid (noun)	malonylurea (noun)
a white crystalline acid derived from pyrimidine; used in preparing barbiturate drugs	a white crystalline acid derived from pyrimidine; used in preparing barbiturate drugs