pastil vs cough drop

pastil and cough drop both are nouns.

Word	Noun	Adjective	Verb	Adverb
pastil	Yes	No	No	No
cough drop	Yes	No	No	No

As nouns, pastil and cough drop are synonyms defined as:

Other synonyms of pastil include pastille, troche.

pastil (noun)	cough drop (noun)
a medicated lozenge used to soothe the throat	a medicated lozenge used to soothe the throat