hypnogogic vs soporiferous

hypnogogic and soporiferous both are adjectives.

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

As adjectives, hypnogogic and soporiferous are synonyms defined as:

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

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