Luminal vs phenobarbital

Luminal and phenobarbital both are nouns.

Word	Noun	Adjective	Verb	Adverb
Luminal	Yes	No	No	No
phenobarbital	Yes	No	No	No

As nouns, Luminal and phenobarbital are synonyms defined as:

Other synonyms of Luminal include phenobarbitone, purple heart, sodium thiopental.

Luminal (noun)	phenobarbital (noun)
a long-acting barbiturate used as a sedative	a long-acting barbiturate used as a sedative