The difference between Drunk and Piss artist

When used as nouns, drunk means one who is intoxicated with alcohol, whereas piss artist means someone who is frequently drunk (pissed).

Drunk is also adjective with the meaning: intoxicated as a result of excessive alcohol consumption, usually by drinking alcoholic beverages.

check bellow for the other definitions of Drunk and Piss artist

Drunk as an adjective:

Intoxicated as a result of excessive alcohol consumption, usually by drinking alcoholic beverages.
Drunk as an adjective:

Habitually or frequently in a state of intoxication.
Drunk as an adjective:

(usually followed by with or on) Elated or emboldened.

Examples:

"Drunk with power he immediately ordered a management reshuffle."
Drunk as an adjective:

Drenched or saturated with moisture or liquid.

Drunk as a noun:

One who is intoxicated with alcohol.
Drunk as a noun:

A habitual drinker, especially one who is frequently intoxicated.
Drunk as a noun:

A drinking-bout; a period of drunkenness.
Drunk as a noun:

A drunken state.

Piss artist as a noun (British, slang):

Someone who is frequently drunk (pissed).
Piss artist as a noun (British, slang):

Someone who claims knowledge or understanding that he does not possess.
Piss artist as a noun (British, slang):

Someone who frequently ridicules others (takes the piss).