sedative-hypnotic drug vs sedative-hypnotic

sedative-hypnotic drug and sedative-hypnotic both are nouns.

Word	Noun	Adjective	Verb	Adverb
sedative-hypnotic drug	Yes	No	No	No
sedative-hypnotic	Yes	No	No	No

As nouns, sedative-hypnotic drug and sedative-hypnotic are synonyms defined as:

sedative-hypnotic drug and sedative-hypnotic: a sedative that depresses activity of the central nervous system and reduces anxiety and induces sleep

sedative-hypnotic drug (noun)	sedative-hypnotic (noun)
a sedative that depresses activity of the central nervous system and reduces anxiety and induces sleep	a sedative that depresses activity of the central nervous system and reduces anxiety and induces sleep