Cough drop and Horehound

Cough drop noun - A medicated lozenge used to soothe the throat.

Horehound and cough drop are semantically related. in medicated lozenge topic. In some cases you can use "Horehound" instead a noun phrase "Cough drop".

Horehound noun - Any of various aromatic herbs of the genus Marrubium.

Cough drop and horehound are semantically related. Sometimes you can replace phrase "Cough drop" with "Horehound", this terms are similar.