sleeping draught vs sleeping capsule

sleeping draught and sleeping capsule both are nouns.

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

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

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

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

sleeping draught (noun)	sleeping capsule (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)