sleeping capsule vs lozenge

sleeping capsule and lozenge both are nouns.

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

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

sleeping capsule: 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 capsule include pill, tab, tablet, hypnotic, soporific.

sleeping capsule (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