sleeping pill vs sleeping tablet

sleeping pill and sleeping tablet both are nouns.

Word	Noun	Adjective	Verb	Adverb
sleeping pill	Yes	No	No	No
sleeping tablet	Yes	No	No	No

As nouns, sleeping pill and sleeping tablet are synonyms defined as:

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

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

sleeping pill (noun)	sleeping tablet (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)