soporiferous vs hypnagogic

soporiferous and hypnagogic both are adjectives.

Word	Noun	Adjective	Verb	Adverb
soporiferous	No	Yes	No	No
hypnagogic	No	Yes	No	No

As adjectives, soporiferous and hypnagogic are synonyms defined as:

Other synonyms of soporiferous include hypnogogic, somniferous, somnific, soporific.

soporiferous (adjective)	hypnagogic (adjective)
sleep inducing	sleep inducing
inducing mental lethargy