soporiferous vs hypnogogic

soporiferous and hypnogogic both are adjectives.

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

As adjectives, soporiferous and hypnogogic are synonyms defined as:

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

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