Yes the word drug is a noun. It is a common noun.
The compound noun is 'drug store'. A drug store is also called a pharmacy (not a compound noun).
Drug
The noun 'drugs' is a countable noun, the plural form of the singular noun 'drug'.A countable noun is a word for something that can be counted, something with a singular and a plural form.Example: That is the most common drug for your condition but there are other drugs available.
The compound noun is drug pusher.
It can be a concrete noun when it refers to a drug. Otherwise it is a process synonymous with the gerund medicating.
The word Reglan (capital R) is a proper noun, a brand name drug of Schwarz Pharmaceuticals.
Reaction time is a noun. Speed is a hard drug.
The proper noun anagrams are Ireland and Inderal (the drug propranolol)
The correct spelling of the noun is "medicine" (drug) and the adjective is "medical".
Combat can be a noun or a verb.As a noun: "They were injured in combat."As a verb: "Red Ribbon Week was instated to combat drug and alcohol use."
Yes, the word antibiotic is a singular, common, concrete noun; a word for a drug that cures illnesses and infections caused by bacteria; a word for a thing.
The term 'over the counter' is a prepositional phrase(the noun 'counter' is object of the preposition 'over').This prepositional phrase often functions as an adjectiveused to describe a drug available without a doctor's prescription or stocks traded outside a formal stock exchange.Informally, this phrase is sometimes used as a noun as a word for the drug or the stock; as a word for the thing itself.