sleeping capsule vs sleeping draught

sleeping capsule and sleeping draught both are nouns.

Word	Noun	Adjective	Verb	Adverb
sleeping capsule	Yes	No	No	No
sleeping draught	Yes	No	No	No

As nouns, sleeping capsule and sleeping draught are synonyms defined as:

sleeping capsule and sleeping draught: a soporific drug in the form of a pill (or tablet or capsule)

Other synonyms of sleeping capsule include sleeping pill, sleeping tablet.

sleeping capsule (noun)	sleeping draught (noun)
a soporific drug in the form of a pill (or tablet or capsule)	a soporific drug in the form of a pill (or tablet or capsule)