purple heart vs sodium thiopental

purple heart and sodium thiopental both are nouns.

Word	Noun	Adjective	Verb	Adverb
purple heart	Yes	No	No	No
sodium thiopental	Yes	No	No	No

As nouns, purple heart and sodium thiopental are synonyms defined as:

purple heart and sodium thiopental: a long-acting barbiturate used as a sedative

Other synonyms of purple heart include Luminal, phenobarbital, phenobarbitone.

purple heart (noun)	sodium thiopental (noun)
a long-acting barbiturate used as a sedative	a long-acting barbiturate used as a sedative