sleeping draught vs lozenge

sleeping draught and lozenge both are nouns.

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

As nouns, lozenge is a hypernym of sleeping draught; that is, lozenge is a word with a broader meaning than sleeping draught:

sleeping draught: a soporific drug in the form of a pill (or tablet or capsule)
lozenge: a dose of medicine in the form of a small pellet

Other hypernyms of sleeping draught include pill, tab, tablet, hypnotic, soporific.

sleeping draught (noun)	lozenge (noun)
a soporific drug in the form of a pill (or tablet or capsule)	a dose of medicine in the form of a small pellet
	a small aromatic or medicated candy