dope

The word “dope” means (informal) An illegal drug, especially marijuana or heroin. In plain terms, depending on context: an illegal drug, inside information, a fool, or (as slang) something excellent.

“Dope” is pronounced dohp ([doʊp] in IPA).

Here is “dope” used in a sentence: “Police found a small stash of dope in his jacket.”

Depending on how it is used, “dope” can be a noun, an adjective and a verb.

The word “dope” dates back to around 1900 and comes from Dutch. From Dutch doop, a thick dipping sauce, related to a verb meaning "to dip." The drug sense grew from thick, sticky opium paste; the "cool" slang sense is a later 20th-century development.

“Dope” is a fairly common word in modern English.

“Dope” has 5 distinct senses listed in this dictionary. The most common is: (informal) An illegal drug, especially marijuana or heroin.

Yes, as slang, describing something as "dope" is a compliment meaning it is excellent, impressive, or cool, as in "that jacket is dope." This positive adjective sense is informal and separate from the noun senses of dope, which can mean a drug, inside information, or a foolish person.

Part of speech and context separate them. As an adjective ("that's dope") it means excellent or cool, while as a noun for a person ("he's a dope") it means someone foolish or stupid. The admiring slang sense is positive, whereas calling a person a dope is an insult.

A dope is a foolish or stupid person, describing someone's lack of sense. A dupe is a person who is tricked or deceived by someone else, so a dope may act foolishly on their own while a dupe is fooled by another, which makes the two words not interchangeable.