cough drop vs troche

cough drop and troche both are nouns.

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

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

Other synonyms of cough drop include pastil, pastille.

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