cough drop vs pastil

cough drop and pastil both are nouns.

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

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

Other synonyms of cough drop include pastille, troche.

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