soporiferous vs somniferous

soporiferous and somniferous both are adjectives.

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

As adjectives, soporiferous and somniferous are synonyms defined as:

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

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